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silent running)

Mike, thanks a lot for the details and pictures. Took me a while to figure out exactly how it all works.
I tried just explaining it, then decided it was too complex so took the camera out to the shed. This setup makes sense to me, but that probably says as much about me as it does the configuration...
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Questions:
1) How is it doing a back roll off the boat with side mounts? Do the low hanging cyls get caught on the gunwhales?
I've only ever rolled off with one 40cuft - which has worked no problems on both hardboats and Ribs. If you lay the butt of the tank in the right place it seems to work OK. I normally dive off boats where you can waddle off the back though.
Tanks can get caught under a rail on the side of the boat when butt backwards - you need to move forwards and up to stand up.
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2)I'm not completely clear on where you're fastening the upper bungee. Are you using the little D-ring on the bottom of the CL, or are they the ones I see attached to the sides of the BP?
The upper bungie is the loop that is threaded through the back plate. Having once piece of bungy that goes all the way behind the back plate lets you have more slack to stretch the loop over the tank neck when you clip one on at a time. I clip the bungy loop into the 1" counterlung attachment so I can reach it with the unit on (not shown in photos)
I don't use the little dring for anything
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3)And I'm still wondering why, if the d-rings on the web shoulder straps aren't supporting any weight, you couldn't just use the stock fastex clip and the loop it attaches to and thread the new waist web belt through it?
You can.
I just like having the plate so the counterlung attachment doesn't move around. The loops with the buckle would work completely OK - just like they do stock.
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Give that the weight of the BO cyls is now hanging off the waist, I'd be most happy with a harness that made use of the stock Prism CL fastex/weight baring system, as it's most easy to don and doff.
That's how it works for me. I wanted to keep the ability to detatch the bottom of the counterlungs completely and have no other shoulder straps. This lets me duck under the counterlungs and loop in one go, then clip stuff up.
Having the additional shoulder harness annoyed the crap out of me, made it a lot tougher to get in and out of.
Mike