[Text and photos courtesy of Jim Van Orsdol] After marking the center of the puck as well as the desired length of the oval, I placed it in a drill press vice and then with a 7/8ths drill, bored a hole approximately 1/4" deep at the center point. I then moved the vice an appropriate amount each way and drilled for the extremities of each end. From that point on, it was a matter of holding the vice firmly while using the spinning drill in a milling machine fashion and taking small bites (both depth and width) while checking against the actual jack. This worked quite smoothly, as the rubber material is easily removed. Once I arrived at a somewhat snug fit I called it quits, but a bit oversized is not a problem.
As an aside, pucks work nicely as extension pads for a two-post jack, as well as a cushion for a floor jack or jack stands if the jack stand pads are of the rather flat variety. I'm sure that creative 356ers can think of other neat uses as well. Pucks can be found here.
[Text and photos courtesy of Jim Van Orsdol]