Also don’t just swap out o rings, sir. Part of “rebuilding” a reg is to clean it all out with either denatured alcohol or acetone.
I am unfamiliar with the reg and how it’s positioned in an avenger. If it’s a tube installed reg like a typical Huma in a wildcat I’ve found that sometimes “seasoning” the air tube in the area only where the reg sits at helps. That is to completely remove all lubes using acetone, then take a fine grit like 1500 wet/dry sandpaper and scuff up the area where the reg sits at. Clean the tube one more time with acetone and just apply a thin coat of silicone lube on the o rings.
the o rings now have a good biting point in the tube to create the seal.
sometimes too much lube in an air tube causes an o ring to roll once the air pressure pushes against it, causing a leak