I too need help with this. I can't figure out how I'm suppose to replace the oring in the puncture pin area. Am I suppose to find a super big flat head to unscrew the valve? Cause as of now, I have no screwdrivers that are big enough to turn the puncture pin valve area.
Call Paintball Solutions and ask for delta valve face orings. That should fix the leaking problem. The valve face is also available as a complete unit.
Usally you can use a regular sized sflat head screwdriver on one side and remove the valve face. You can replace the oring with out removing it.
Also keep the valve face oring lightly grease to prevent damage.