How do;
A while ago I was asking advice on kitting my Rohm sport out with the Co2 adapter. Job now complete and working OK.
Had to rig something up for the regulator removal, the Co2 kit just needed a ring spanner 13mm I think.

Changing the bulb is a lot easier than pumping, accuracy no noticeable difference and decent shot count.

I'll stick with this for a while see how it goes, thanks for the advice.
John