The following is from the manual:
There are only three wear items that will eventually require attention.
The first is the piston Oring, which is a standard 015 series urethane ring. If this
ring wears, you will experience leakage around the adjusting collar. To replace
this ring, remove the snap ring, and gently remove the piston assembly from the
reg body. No other disassembly is required. Be sure to lube the new Oring with
airgun or air tool oil, and to replace the snap ring when re-assembling.
The power tube Oring and the Reg Seat are both reached by the same
procedure, and it will probably save work if they are replaced as a set. A worn
power tube Oring will cause leakage around the adjusting collar, and a worn Reg
Seat will cause inaccurate delivery pressure.
To access these parts, first remove the Adjusting Collar lock screw, and turn the
Adjusting Collar to it's maximum travel. This will expose a second set screw,
which also should be removed (5/64” Allen key). Once that is done, you will be
able to unscrew the Adjusting Collar the rest of the way, and separate the reg
into it's two halves.
When that step is completed, you can grasp the top end of the Seal Retaining
Cap with a pair of SOFT JAW pliers and unscrew it . This will give you access to
both the Oring and the Reg Seat. (See the following page for detail illustration.)
To re-assemble, simply reverse the procedure.
**If you require the diagram...try downloading Adobe Reader 6.0, then link here: http://www.evil-paintball.com/EVIL_DETONATOR_MANUAL.pdf