Thanks Nelson, glad to see you found one. I think you will find it useful if you need to tap a lot of holes on or off the DP.
Once it is in the drill press chuck and you have inserted a collet and tap all you need to do is bring the quill down into the hole
then grip the rotating hub and it should tap into the hole. When it is deep enough just release your grip, move the quill up about
1/2 inch and grip the other rotating collar and the tap should back out. You can stop the process anytime since you are the "gripper".
As soon as you release the rotating collar the unit just free wheels. You have total command with the quill and the grip.

Cheers, JR