My first independent doubles used old-school galvanized (?) doubles bands (the ones that were built for the old US Divers and Scubapro plastic blow-molded backpacks, built with that little welded-on "arch" meant to mate with the curve molded into those backpacks) that I happened upon in the used gear box in a LDS.
I mounted the bands on a couple of 7.25" cylinders, attached them to my Scubapro SSJ (the 1987, orange, taco pocket model), and spent a few minutes "playing" in the rise pool of a local freshwater spring (Roubidoux Spring - Wikipedia). This was only a few weeks after I had completed my NACD/NSS-CDS Cavern and Basic Cave certs--so, you can guess what happened next...!
Fun times!!
rx7diver
