Did a minor tune on my San Rafael 55T,spring, old school buttons and lube, piston seal. I did "grind" the spring face however as shown with the idea no evidence) that this would reduce forces off central axis upon expansion. In any case the shot cycle is just simply wonderful, a solid thump (with the springer "jolt" we come to love) but no vibration or twang.
set up, alu channel, clamp,
stands by self - all done