Re: Mystery tool
It's for quickly denuding coax of its outer sheath. Fit over the cable, do a single turn to cut the circumference of the sheath, turn the knob through 90 degrees and pull along the length of the coax, the blade then doing a longitudinal slit so the stripped piece of sheath is easy to peel off.
[In the dim mists of time I had a big one for doing 100-pair telco cables too]
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