Originally Posted by Tronpxs
4. now take a 10/32 screw / breech rod, and screw it into the copper fitting.... once screwed in, pull the entire lpr out... there are other ways the get the LPR out but this way is the proper way
For reference, the UL frame screws are 10/32 threaded.
It's also possible (though a bit risky) to simply air up the gun with both the LPR cap and set screw removed. Since there is nothing left to hold the LPR in place, the pressure it receives will cause the LPR to "pop" out of the gun. If you decide to do it this way, you should make sure to point the back of the marker into a pillow before airing it up.
EDIT: I misread your post. You say you removed the adjustment screw? You need to leave that in if you want to remove the LPR. The two things you need to take off are the LPR cap and the set screw. The set screw can be found by removing the UL and looking underneath where the LPR sits.