Yeah, I can pull enough current to light a red LED, so that's got to be close to 150mA. I was thinking an NPN transistor for the switch control. I'm trying to learn more about them. The trigger uses a simple push button, similar to the Arduino Uno reset button. I think I could patch my transistor between the push button and the motor.
I'm waiting for the carbon brush to arrive by mail, but I intend to pick up the charge off the rotating hub of the rounded drill bit base near the chuck.
Does the NPN idea sound feasible? I'm a noob.