Creating an intermediate pulley bearing holder for the Unimat milling head. In this set-up, two of the chuck jaws in the 4-jaw chuck are reversed. In another set-up I used 1/32" thick slotting saw to cut a slot from the left edge to the bored hole. A cap head screw (hole is visible on top edge) is used to clamp the pulley bearing after slotting the edge. Should have used brass shims to protect the part from chuck jaw marks.