I also have a Tapmatic reversing tapping tool. This is a marvelous tool. You lower the tap into the pilot hole and it slowly taps the threads. You release it and it reverses direction backing out of the hole. For most tapping operations it is a joy to use. I have only tapped relatively thin aluminum and sometimes fairly thick Delrin where it is elegant. It has a 1/2" shaft which fits in the 5/8" drill chuck and works just fine. There is supposedly an MT3 arbor that accepts a 1/2" shaft and likely is held in place by a nut or lock screw.
I have just put the 1/2" shaft in the drill chuck until now, but using an arbor reduces the vertical clearance required and may have better concentricity. Am I imagining such an adapter? I am not finding it on Amazon.
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