Background: (I'm a beginner) I plan on using PCV pipe for the main body. The drill's purpose will be to install screws into pre-cut groves (basically a motorized screwdriver). These screws will be only a couple centimeters tall so the motor will only need a moderate amount of torque and rpm. It takes about 3 turns to install these screws but i would like the fit to be tight so maybe a little more than that would be excellent. I would like this drill to be able to unscrew as well . The problem: I need to chose a small motor that has enough power/torque and rpm to screw in the miniature screws (as well as unscrew) without stripping the groves at a fast but controllable speed. The motor needs to be small but effective and precise. I'm just not sure what kind of motor fits these requirements. Please help?