I think you nailed it Carl. I purchased a wolverine jig from a member here a couple years back and he threw this in the box with it. He wasn't sure what it was either. The link you shared is exactly what it is.I had something similar when I got the penn state sharpening plate. The one that goes on the face of the lathe. the 1/2" rod goes into the tool holder. The knob lets you adjust the orientation. The v plate holds the tool you are sharpening. At least that is what I thought of when I saw the knob and the v-plate.
Yeah!I think you nailed it Carl. I purchased a wolverine jig from a member here a couple years back and he threw this in the box with it. He wasn't sure what it was either. The link you shared is exactly what it is.
Thanks