Quote Originally Posted by TonyL View Post
I know where you're coming from, Gary.

Rob, not a waste of time, it's just that Gary used the wrong wording there with "tube". He means the little cylindrical containers like the vitamin C types of things with a closed end. I've sometimes played with this idea also and wondered if any of them might be the correct size for certain pistons, but never went as far as going round shops with the verniers.
This is what I was thinking, using the base of the container to hold the spring in place. I was even looking at some 22mm plasic piping but I would have had to somehow open the inside diameter up to 21mm and leave the last mm original to act as a lip and I'm thinking this would be nearly impossible.
Delrin guides aren't going to work as the guides are built into the piston and trigger housing.
Perhaps the best solution would be to source a correctly sized spring?
A quick question if I may, does a spring's diameter increase when compressed?