Quote: (Originally Posted by
Drmike)

fair enough, although it would be far better to dremel the adapater than to mess up the 2nd stage. I am sure properly fitting ATX adpaters are only a machine shop away
With no flange or ridge now you will need a location for that screw even more. You may
have to make that dimple
I tugged on it pretty good. No give. I think it will work without the set screw. Amazing enough, the adapter fits pretty tight with the flange and ridge removed. I would have had to gouge a lot of material out of those nice adapters to make it work that way. This particular 2nd stage is dedicated to the mask, so I wasn't too worried about the mod. I believe a mouthpiece will still work on it with a proper zip tie if so needed some day. Otherwise, it will be sold with the mask.
I'm currently evaluating where I'm going to go with OC regulators for the future. I need more, but Apeks has moved on again. I liked them better when they were keeping the product line simple and not so flashy.
Once I decide, I may get a hold of you for a custom run.
Thanks for your help,
Eric