Tom West's Custom PC77 PumpMaster Classic Short Rifle
RE 2100 etc.April 21 2011 at 8:57 PM
CO222 (Login CO222)
Crosman Forum Member
from IP address 126.96.36.199
Response to Specific for 1377?
"don't really have anything holding the valve from forward movement except for the transfer port bucking"
Forgetting about the pump arm pivot? Most of the striker energy goes into cracking the valve.
And prior to cracking the forwards movement is resisted by the pump linkage.
The reaction force on the pivot pin in idle state is the pressure on the front side of the
check valve multiplied by piston area. This is the force the striker must overcome
to even start the valve body moving forwards.
Extra securing never hurts unless it's positioned badly. If the holes are aligned
so that the screw takes all the piston's force before the rear lip does, then you
could end up with a damaged screw that's hard to remove.
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