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Sorry, I was interupted by our systems people who installed a new 
mail reader.  Had to finish the post early and omitted a couple of 
comments.

You can't do much maintainence on these regs underwater! I guess the 
water would dampen the circlips movement but I actually meant that 
they're easy to overhaul on a bench - so long as you have the right 
tools. 

Water leakage into the second stage is a regular problem with some 
divers.  I have only ever traced it to obvious debris under the 
exhaust diaphragm of both cyclon and odin, or the switch o-ring.  
This used to be a replaceable item.  The o-ring is no trouble.  It's 
the switch that gives problems.  I still have the individual 
components but Poseidon no longer supplies them and you now have to 
replace the complete body...quite an expensive for teh sake of 1 
o-ring.

Yes, the old Cyclon 300 were unbalenced diaphragm regs.  The reason 
they out performed Conshelf and the other contemporaries was that the 
intermediate pressure actually increased as the tank pressure 
decreased.  That, combined with the relatively large first stage 
valve size and design gave it the edge.

Unfortunately Poseidon was badly represented in New Zealand so shops 
and service people  are scared of touching them.  Interestingly, 
their popularity is increasing with the increase in South African 
immigrants.

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