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I have serviced these regs since 1979. We used them exclusively until the
Odin appeared. I recently sold our old ones off for $50 each (Greg Ryan
bought 4).
They are simple to service BUT, your dive shop has to have the special
tools AND metric spanners. The first stage is unbalanced but, with this
type of diaphragm reg, inhalation effort decreases with the tank pressure.
The Cyclon 300 consistantly outperformed all of it's contemporaries and
because it didn't change at all during it's production life, it's reported to
be the most popular reg in the world (on sales figures).
Yes, we did have frequent free flows caused by the second stage piston
seizing in it's housing. Both are chrome plated brass and the clearance is
too small IF corrosion occurs. Usually this happens when a diver is
getting back into diving after a few weeks or months break. The reg free
flows as the purge button is depressed. This is cured by turning off the
valve and dunking the second stage in water to dissolve away the salt. I've
never known of a 300 to free flow during a dive.
Steve Mercer - Diving Officer Snailmail: Fisheries Research Centre
PADI MI 451072 PO Box 297
Usenet: mercer@fr*.ma*.go*.nz* Wellington
Telephone: +64 4 3860 507 NEW ZEALAND
FAX: +64 4 3860 574
Telex: MAFFCC NZ30049
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