12 gram check valve

[nucks]

I’m attempting to build a drop in check valve to add to my 12 gram changer.
so far I have a sconi bucket changer
s ball bearing salvaged from a roller bearing (skateboard bearing)
and
i have o rings that are small enough to seal the bearing
my question is, what spring works best? I was thinking a cut down tippmann drive spring but I’m interested to hear what others have done

[Chuck E Ducky]

Not sure about the Sconi but the CCI one a pen spring often does the trick. Back pressure dose most of the work the spring just keeps it seated properly. The one I have is just a small reg seat type material and a pen spring.

[nucks]

Nice
I’ll have to try that

[ThatBobbyjoe]

What Chucky said. I tried a few different things and didn’t have good results untill I tried a flat disk cut out of a mag seal and a pen spring.