Mystery solved! And thanks once again Tommy for your expertise. I don't think I'm the only Rogers owner who just assumed that the Swivo pedal was phased out along with all the other Swivo hardware when the Big R Memriloc stuff was introduced. Who would have thought that Rogers would keep producing this one Swivo item long after the Swivo high hats, cymbal stands, and mounts were all retired. Why they kept producing the Swivo pedal is another question, but there obviously must have been demand for what was the most versatile, adjustable pedal ever made.
The 1983 catalog does in fact confirm the final availability of the Swivo pedal, as it came standard on the Big R "Heritage" setup (18" bass and 14"FT!) ...
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I can see the advantage of the lever clamp, as it enabled the user to easily attach the pedal on different bass drums without the need for multiple detachable hoop clamp assemblies. Wouldn't mind owning one of these.
Mike