New Retro leaking......Help!

[Magnus1028]

I finally tried out my Retro valve and it shoots great. But I have a problem, It has a very small leak down the barrel. I've changed the power tube spacer to the smallest one but I still get the leak. Does AGD make smaller ones? Or do I have to do something else? Any info would be great.
Thanks

[Xzion]

Try taking the power tube O-Ring out and rubbing a drop of oil onto it, that worked for me once when nothing else did, it seems like the o-rings get to dry after awhile.