power on a standard medalist

[kada82]

put my medalist back together and chrono,d it and power is 3.4 with 14.5g superdomes and 4.0fpe with 11.9 hobbies both at 10 pumps its the 1989-1996 so think its a phase 2 model. ive drilled an hole in the grey plastic probe to aid flow and thats it. also after getting the pump arm pin out (what a *******) its now working itself loose when i pump it?? yet when i knock it back in it takes alot of force

also is it common for the seal cup that pushes the air into the valve. to wear out quickly

[Crosshairs]

You need to put a drop of oil on the pin in the middle the reason its working out is its spining when you pump the gun.  I think  also you need to put a drop of oil on the piston seal if its dry.
                                                  Mike

[arkmaker †]

What Mike said, plus you might want to invest in a pump pin from MellonAir.

Rich

[hotshot]

My 1377 worked its way loose within 50 shots  but recently I fitted a mellonair pin and solved that
have a look here on how to fit it:
http://www.crosman-air-pistol-owners-forum.com/board/index.php?topic=4378.0