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It is only "true rotary" if the hook shank is in -line with the jaw axis.

If you put a hook in the jaw in the normal method (near the hook barb), it will no longer be "true rotary"

A rotary...

Hap,
Correct me if I'm wrong. I had a Norvise many years ago. The Norvise is in-line rotary.....not true rotary?

Interestingly, not all rotary vises are "true rotary" in the majority of hook sizes.
Most rotary vises have some sort of adjustment which allows the jaws to maintain true rotary even if you change...