navycop wroteOnly the #2MT (not #1MT) mandrel will work with the drill chuck? I am looking at just doing 7mm slimline pens right now. I know I will have to buy the bushings separete.
Neither the 1MT or 2 MT will fit any of the chucks. What you have to do is remove the rod of the mandrel from the taper, if you can. Some are threaded. Some are welded or pressed. Threaded are easy to remove. The rod can then be inserted into the Jacobs chuck or 1/4" router chuck.
I bought the SS mandrel from Penn State and find it works beautifully.