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Old 08-26-2006, 11:07 PM #1
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Agitator bolt!! YEAH BABY! o-rings are here!!!

Though others may have done this, I'm the first person I know of. I call it the agitator bolt.

Turn your delrin-bolt without o-rings into a gas-efficient o-ring bolt! Also- you can remove that pesky built in venturi found in shocktech pre-alias bolts! I made my detent groove as big as the dragun stock bolt has, so it wonít trash the ball detent! Read-on.

DONíT BLAME ME IF YOU HAVE TROUBLE DOING THIS/MESS-UP YOUR MARKER AND/OR TOOLS IN THE PROCESS! I AM PROVIDING HINTS AND SUGGESTIONS ON HOW TO IMPROVE YOUR MARKER. BE SMART. IF SOMETHING DOESNíT SEEM LIKE A GOOD IDEA, ITíS YOUR RESPONSIBILITY TO MAKE THE CALL.
I am not responsible for any damages you may do to your property*

What you need:

ANY crappy delrin bolt w/o o-rings
A drill (not absolutely necessary) and a few bits, or a pencil.
A dremel (>god) and tips
Safety glasses

VENTURI REMOVAL:
The venturi is the star thing in the end of the bolt. It supposedly reduces turbulence. Youíll notice high-end bolts donít have it. Itís old technology. It restricts air flow. TAKE IT OUT!


1. Take a dremel, get a cutter like this:

2. Chow-away at the venturi, being careful not to cut into the outside walls of the bolt:
Wear safety glasses!



3. Get an abrasive stone that will fit inside the end of the bolt. Run it around gently to de-burr and smooth the inside of the bolt so air can flow well.

It should look like this when youíre done:

Thatís it! Just wash the bolt to get-rid of the delrin filings. Also- you can get-rid of an aluminum venturi by un-screwing it with long needle-nose pliers. If itís an aluminum bolt with a bunch of holes, the above method should work*

O-RING GROOVES!!! YEAH, BABY!
Though people have probably done this, Iím the first one I know of, so I call it the agitator mod, lol!

1. Chuck a large drill bit into your drill (you canít do this, unless you have a bolt without a venturi). Wrap the bit in a rag and stick it snugly into the front of the bolt: (I disassembled mine to do this, but you donít have to if your bolt is a one-piece one... thatís no problem.)


2. Make sure the bolt is centered ie; when the drill turns, the bolt doesnít move from side to side. This will ensure that the grooves are the same depth all the way around. This step is very important. If you donít have a drill, you can rotate the bolt by hand while dremeling. This will take more time/effort and probably wonít be as good. Then again- not all of us have drills.

3. Put a cut-off wheel on a mandrel and chuck it into your dremelís collet. Wear safety glasses! On a slow speed (3/5), cut into the material on either side of the air inlet as the drill rotates at a slow speed. Go slowly and make sure you donít cut too deep, or your bolt will break in half, which is bad! To make a wider groove, turn the dremel, so the wheel is rotating on a different axis than that of the bolt. If you donít know what I mean, feel free to pm me about it. I started on the forward groove of the two, since the seal of that particular ring isnít as important as far as blow-by is concerned.
It should look like this:

4. Do the other groove, and make both grooves a little shallow. Test fit Ďem a few times and take the material off slowly. The bolt should fit in the gunís bore snugly, but it should be effortless to slide it. There shouldnít be any free play and the bolt should drop outtaí the gun if you tip it... You donít want a lot of friction.


5. Once the grooves are the right width/depth, wash+dry the bolt and re-install it. Also- if you do make the grooves a little too deep, wrap some teflon tape in the grooves to act as a shim. This will make the o-rings tight enough again*

DETENT GROOVE
tired of your bolt pushing and wearing your ball detent? If it has a groove thatís too small, make it bigger! Some guy tried this on my bolt with a (jackknife?). LOL! Iím gonnaí use a dremel!!

1. If possible, compare the bolt to your stock one, so you know how it should look

The delrin bolt is shorter, so the groove doesnít have to be as long in this case.

2. Using a dremel and tapered stone, carefully remove the material at a medium speed. Wear safety glasses!

3. Check the groove as you go. Make sure itís even and also that it doesnít get too big. Wipe the bolt occasionally and re-install it to see if it pushes the detent. Itís okay if it bumps it. You just donít want it hitting the detent and/or depressing it very far. The groove may be a little rough when you finish. Some 400 grit sandpaper and patience should smooth-out the marks. ONLY SAND THE GROOVE. The outside of the bolt is smooth and nice. You donít want to damage the finish.

4. The bolt should look like this when you are done. Wash it and re-install it when itís dry.

Pm me with any questions.
I'll be making a switch mod tutorial. Link will be in my sig soon!
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Old 08-26-2006, 11:10 PM #2
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Nice mod but I have a feeling your delrin sleeve will snap where the Oring grooves are.

Overall nice job
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Old 08-26-2006, 11:28 PM #3
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thank's for the compliments. Yeah- I'm worried about it too, but I checked the thickness of the remaining material and it seems all right. We'll see. It's the thinnest bolt I've seen, so the mod will probably work better with other bolts. I have some with o-ring grooves factory done and the sleeves they used were thicker.
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Old 08-26-2006, 11:58 PM #4
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Old 08-27-2006, 08:44 AM #5
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Old 08-27-2006, 09:10 AM #6
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Thank's.
If you guys do this, remember the concern opteron has... if it's too thin a bolt to start with, the grooves may weaken it too much.

After a few cases (fingers crossed), I'll report as to whether or not the bolt is still alive*
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Old 08-27-2006, 11:10 AM #7
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put this in the ultimate sticky.... under mod page
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Old 08-27-2006, 04:18 PM #8
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Nice tutorial.....good for those who know what thier doing.
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Old 08-27-2006, 06:22 PM #9
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Dude I think that many people have thought of doing this they just werent stupid enaugh to take the chance on ruinning there bolt. BUT you succeedid and for that I respect you.
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Old 08-27-2006, 07:15 PM #10
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It would be handy if you have a set of calipers to determine the depth and width of the O-ring grooves. I wouldnt mind knowing how far to go before attempting this.
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Old 08-27-2006, 09:52 PM #11
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Quote:
Originally Posted by SexyFatKid
Dude I think that many people have thought of doing this they just werent stupid enaugh to take the chance on ruinning there bolt. BUT you succeedid and for that I respect you.
when I first started reading your post, I thought it was gonna' be a diss, lol. Thank's for the compliment!

Quote:
Originally Posted by SonyMobile
It would be handy if you have a set of calipers to determine the depth and width of the O-ring grooves. I wouldnt mind knowing how far to go before attempting this.
Well... That's a good idea. I just took it slowly and kept checkin' it. Do you mean so that you know you're not gonna' cut all the way through? That was a concern of mine. One thing you can do is just check the thickness of the o-rings and compare it to the end section of the bolt. Most bolts are thicker than the one I used and mine was all right...

My friends and I have hypothesized about the thickness of the delrin. We don't think it's an issue with mine as far as strength goes. I have some delrin stock and even the thinnest piece of it is ROCK HARD...
I'm just thinking out loud here*

Quote:
Originally Posted by the atacker
put this in the ultimate sticky.... under mod page
I'm considering it. thank's for the support

Last edited by Agitator : 08-27-2006 at 10:02 PM.
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Old 08-28-2006, 08:41 AM #12
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Well, First off, I would probably be move inclined to use a lathe, which would make it easier to make the cuts, with precise measurements.

Second, yes, the thickness of the materials is a lot to take into account. That bolt slides back and forth pretty quick, and i'd say with quite a bit of force. Make those cuts a little to far and your bolt will be junk within a few shots.

Also, how far apart did you space the O-rings? Is there a specific reason why they are this distance apart?
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Old 08-28-2006, 11:48 AM #13
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Quote:
Originally Posted by SonyMobile
Well, First off, I would probably be move inclined to use a lathe, which would make it easier to make the cuts, with precise measurements.
well... for those with a lathe (such as nunekin), they can just make their own bolt, or do o-ring grooves with ease. I agree that lathes are better, but not everyone in these forums has one
Second, yes, the thickness of the materials is a lot to take into account. As far as the thickness goes... I've done pottery, throwing huge vases and fancy bowls/saucers, etc... so I have a sense for the thickness. I agree that a caliper would be great to have, but if you have a bolt lyin' around that doesn't mean anything to you, 'cause it's a bad one... why not give it a try?That bolt slides back and forth pretty quick, and i'd say with quite a bit of force. Make those cuts a little to far and your bolt will be junk within a few shots. I totally agree. Especially when you chop and jam a shell in the bore between the bolt and the side of the gun...

Also, how far apart did you space the O-rings? Is there a specific reason why they are this distance apart?
I just spaced 'em according to how far apart the ones were on teh stock bolt. I'd recommend others do the same. However, some bolts have different size holes. Aftermarket ones sometimes have bigger/smaller ones. You don't want to mimick the stock spacing if it means your o-rings will be overlapping the hole. If they're too far apart, the front one will be visible in the breech when the bolt is in the forward position. You don't want this. It will lead to premature o-ring failure, as well as blowby(?)
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Old 02-10-2007, 08:46 PM #14
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i cant get the delrin sleeve off prolly all ht ebetter tho as i would mess it up horribly
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Old 02-10-2007, 09:04 PM #15
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what in the world gave you the urge to dig up and revive a thread from august?
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Old 02-10-2007, 09:06 PM #16
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i found it in the ultimate sticky... for some reason i thought that the thread had like died and moved on, u kno? i thought it lived there now and that if i posted it wouldn't bring it back up here... idk.
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