Quote Originally Posted by Mark A View Post
I'd have thought someone would have known the answer to this with all the shed tuners on here..

I guess I also need to measure the original spring guide to choose the best fitting ID spring. On my other HW95 I bought a WW kit that was utter garbage and I ended up sanding down the original spring guide to fit the Titan spring that came with the kit. So maybe one of the springs with a slightly larger ID would be ideal.
It would appear that it is just a shorter version, but whether it will be right is another matter.

I have two HW80's in .22. Outwardly they appear the same, internally they have both been treated the same and have new seals along with 15mm short stroke extensions and they both produce roughly 11-11.2 fpe. They both have shortened genuine Hw export springs, one with four coils removed, the other with six?!

Every single gun is different, that's why some kits are over powered, some under. I beleive starting with a spring known to need shortening is your best bet. Nothing ruins a gun like dead preload added to a weak spring! Start high and slowly reduce your spring until you get the power you want.