I hope to Maz
Jon I used lots of pre-load to try to counteract any piston bounce, I'm going to redesign the piston now because as it is I'm not in the springs sweet spot. When I did the original conversion for last years springer bash I used the heavy standard spring to counter act bounce & a lot less pre-load.
Hello John, I do lighten my pistons on the 95, 77/97 & short stroke them using an alloy head. This is the last 97 piston i did this week that's 30gms lighter with the short stroke, bearings & seal than a bare standard piston. If you don't mind me saying delrin is not the material to use for piston noses, it will fail in time. Delrin is a good bearing material but doesn't take shock too well.
Generally I short stroke 77/97 in .177 by 8mm, 95's by 12mm, .22's shorter. My own 25mm HW77 in .22 is 68mm with an "O" ring conversion.
Thanks for your comments guys.
I have a couple of .20 HW's to do, a 95 & a nice Green Laminate 77 as well as 2 TX's the later 3 being my own rifles that I hope to bring to the springer bash together with a Diana 280 in .177 & a HW99s that I did the anti gall fix on myself, in a different way to Tinbum! Think I might put some pics up on a new thread of that?