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Hi everybody,
	Does anyone have any experience with tuning/overhauling the
built-in 2nd stage regulator on the USN MK-1 MOD O Face mask?  It's
manufactured by U.S. Divers, but its design is unlike any standard USD
reg. I've ever seen.  The main things I need to know are:

1) what intermediate pressure does it like to have? (I've played with
everything from 50psi - 200psi, and it seems easiest to breathe around 100psi)

and
2) What tension should I adjust the seat (disk/retainer assembly) nut at?

I just finished rebuilding the mask yesterday afternoon & took it for a
test dive in 5 feet of water.  Seems to work pretty good - it doesn't
breathe very easily on land, but underwater it's not so bad.  I'd still
like to tune it a little better, though (hence the above two questions).  
I'm hoping to use it with my surface-supplied O2 decompression rig.

Thanks, and Aloha,

Rich

deepreef@bi*.bi*.ha*.or*

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