....I made my first back plate in early 1979 from a surplus aluminum road sign of unknown alloy. I traced the outline from the solid center section of the Scuba Pro BCP onto a paper stencil and transferred this onto the aluminum. I next cut out the aluminum and had a single parallel set of bends, about 2" apart, made in the center of the plate, running from top to bottom, forming a sort of flat bottomed "V", into which I drilled two holes (one top/one bottom), which were used to bolt the plate to extended studs on a set of bands on double 72s. I then proceeded to beat the aluminum around the curvature of the tanks with a sledge hammer, soon discovering that aluminum alloy is pretty tough material, taking several hours to conform the aluminum to the tanks. The webbing off a Navy harness was then attached through a series of slots cut in the metal and the first back plate was born.