Grinding Jig for Bench Grinder
and the taper in the front of the pin vise when you tighten the clamping nut. To be able to register the pin vise in my grinding jig, I drilled two small 2mm holes on opposite sides of the pin vise. This was done with a "special" collet with centre holes in the pin vise. The pin vise was mounted in the dividing head.