There's a lot of questions to be asked here. Are you testing/adjusting these yourself? What kind of tools or diagnostic equipment are you using? Do you have the adjustment/repair procedures for these particular stages?
I tried converting a BP/W to a SM and failed miserably. I eventually bought a Hollis SMS75 and kept the BP/W as a BM. If you're serious enough about SM, get a proper rig if taking this on yourself, so you can concentrate on learning SM. It will be a hell of a lot easier on you.
I do my own repair on aqualung and dive rite first stage and second stage adjustment with a manual that works great in the details in how to perform the techniques in servicing.
@Caveeagle Cool! I don't see much SM in the midwest quarries I frequent, there are a few, but with what you said I feel better about approaching cave training with the setup I have. :)
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