I have a Milwaukee mag drill that I would like to slow down the rpms on. With a mag drill there is no trigger just three push buttons on/off/rev. The speed if I had to guess is between 700 and 1000. I'd like to get that down below 500 and I'd really like to have it variable. Question is can I take the speed dial off another tool and just splice it to the output of mag to input power on drill assy? Their is space on the panel of the mag drill if the unit is compact but I'm okay with a splice on the cord to drill. Any insight would be appreciated thanks.