All right... this morning I came here to see what was being done for a case trimmer motor for my Lyman "hand crank". All were helpful, but not what I needed. So, after buying the drill I wanted to use, I set about machining a coupler to weld to the handle. The results are shown in the picture (insert). I can still use the handle though it is now restricted to the space between it and the coupler and requires holding it clear of the coupler (I don't see using it this way as the motor works in very fine control. Most importantly I need to CONCUR with those who see no value in the length adjustment collars as they will simply not hold adjustment. My solution (worked out when I put this in service) are also shown. I machined spacers for each of the case lengths of various calibers I load and they provide rock solid space lengths. The Lyman collars are set tight to each other and give no adjustment... they simply interface the bushing to their left. I know these solutions are not for everyone as TIG welding and a lathe are required, but it is the only way this type trimmer will work (IMHO). I used a rest for the far end of the drill, but only use it as a holder when the rig is not actively in use. My handle is the type that is pressed on and has spline for the transfer of motion to the shaft. I believe Lyman used this engineering so that it is not easy to bolt on an adaptor (hence the welding). So feel free to E-me with questions or if the picture is not suitable size for clarity. John- "brassman29" at Jbcarey@sbcglobal.net.