Can you just get new jaws for it?
If you don't "need" a rotary, take a look at the new HMH. I'm extremely biased towards HMHs (I got rid of a Regal for one), so keep that in mind
Sorry, if you don't need a Renzetti-style of rotary vise, take a look at the new HMH. Yes, it rotates on the axis of the shaft, no the hook shank doesn't stay in a single plane if you do, but you will be able to look at both sides of a fly.
I was not trying to start a philosophical war over vise terminology. I simplify the vise categories: Renzetti-style rotating (true or full rotary if you wish) and others. Others include ones like a Griffin 2A that does not allow one to "spin" the shaft, others like the HMH that do allow you to spin the shaft.