I needed a way to drill a hole in a shaft that was on the lathe. The fastest way would be to do it on the lathe where it was already setup. I have previously made a Dremel adapter for the QCTP but it is a little fast for drilling so I thought I would try a Dumore type grinder. Here is the result. Two pieces of aluminum, Two brass thumb screws, Two hex screws, a little drilling and boring, some tapping, Two flats on the mill , milling dovetails. The bore is about .001" larger than the grinding head and the two thumb screws hold it tight.
Presto! Instant tool holder. (don't I wish it were instant)