So far I bought two of Sherline's end mill holders. For a CNC job, it looks like I could put a drill-mill in one and an end-mill in the other, make sure the stick-out length was the same, run the first one, add a tool-change pause, which raises the head, stop the motor, change the holders, restart the motor, and continue. This would also be useful if two different diameter tools were needed for a single process. It occurs to me that someone might have made a bench fixture to make it easy to get the tool stick-outs close. Pictures?