Quote Originally Posted by Dr_C View Post
Put a PTFE 'washer' and a 2mm steel washer into the piston head of my 97 last night. Lubed with Krytox.
Took it to the farm for a plink.
No more twist, hitting the 47yrd bell much more consistantly, able to keep the sight picture the same before/after pulling the trigger, power up a smidge by the end of the evening.

A very simple mod that's worth doing IMO.

C.
Excellent. And cheers for the input.

So much about springer tuning is gauged by perceived feel. In his Technical Airgun Series, Jim Tyler actually measures things like recoil and surge on purpose made rigs. It would be very interesting to test a set-up with bearings (either plain or thrust type) and measure the effects. If we could also build in the means to compare twist, that would be most useful.