thanks for your answers,
does the spring reach a full set after one cycle?
does it continue to set thru repeated cycles?
do you think it helps to leave it under a load for a bit to reach it's full set?
i would say not high quality, i don't know enough to guess.
the guns this happened to were made by Crosman with parts made in china.
i am about to try a reseal on a spanish made gun and from what i have seen they seem to be made better.
yes i have rebuilt a few of the airguns i have.
but the best info i can get is a crosshatch of 400 grit which i am not happy with those results as far as seal wear and overall preformance.
it seems to me an 800 grit may be better.
the other thing that puzzles me is with the 400 grit...
thanks for the links this gives me a place to start.
i do know that i do need some lube to remain in the crosshatch to lube the seal.
these seals are for a pellet gun, the maker is Jim Maccari.
i'm sorry i don't know the correct name.
here is a pic of the seal.
it goes on a dovetail at the front of the piston.
i'm not sure but i would guess the durometer to be about 70.
and the cylinder is regular steel.
thanks.