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Tom West's Custom PC77 PumpMaster Classic Short Rifle



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My SSP, I got rid of the delrin spacer that I had between the piston and valve,

July 10 2012 at 5:22 AM
james perotti  (Login jpsaxnc)
Crosman Forum Member
from IP address 71.76.157.166

(it was causing problems),by making the piston rod longer and drilling an air intake hole in the tube. I had noticed that my piston o-ring looked pretty abraded and looking through the back of the compression tube I could see a very rough spot in the tube (manufacturing defect),the last 2-3" of piston stroke, so I've been grinding it smooth. One thing I noticed on this build is that the alignment of the link, piston rod and piston are critical. The piston rod is 5/16" dia. and does not flex. Hopefully I'll have some more results in a couple days.

 
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