The drilldo is actually more of a manual device...holding the drill in hand and pulling the drill trigger down more, or less, to adjust the speed. However, I've thought a few times about integrating it with the fucking machine, likely under the bondage stool (see the recent Chairor of Terror posts for an example of that).  I've also turned other drill uses from manual to more automatic, such as when I turned it into an automatic whipping device...using the ratcheting mechanism, a wooden dowel with leather strapping attached to the dowel, and a pair of hinged handcuffs for the drill trigger. I say hinged cuffs because the non-hinged cuffs I have, and potentially most (not 100% sure), don't have the precision when ratcheting down...there aren't as many fine variable options as to how tight they go.