Atomic ST1 and Z2..I found this interesting...

[Shabaday]

I had an issue with a G-250 caused by the wrong size O-Ring on the orifice. The orifice was a bit loose in the air barrel and would slowly unscrew itself and start to leak. This took many dives. A 70-75ish duro viton 010 O-ring on the poly orifice fixed it. Likely swapped the wrong o-ring when I serviced it.

I wonder if similar could be the culprit here?

Could be?? I sent it to Rsingler and he rebuilt it and problem solved. I don't remember what he found wrong?

 

[Rusty Shackleford]

Could be?? I sent it to Rsingler and he rebuilt it and problem solved. I don't remember what he found wrong?

He would have replaced that o-ring during a rebuild.