Quote Originally Posted by torville View Post
Back in the eighties Cardew recommended popping [hw] spring-guide into piston as a simple way to add weight and a home-turned tophat at the breech end with thrust bearings on both parts to ease spring torque dynamics.regaRDS torville.
It's the other way round!

Top hat shaped guide in the piston, short and light.
Long spring guide at the rear end, breech, ideally fixed to the trigger block to save damage to the rear block by rotational forces. Non moving part so weight is unimportant, meaning it can be long enough to almost touch the top hat when the spring is fully compressed.

Cheers

John