The other problem is the torque. Because you're basically holding an only slightly modified electric motor in your hand the ergonomics suck. Supposedly they are a little better now. Back in the day when I was lifting and turning heavy patients nearly every night, all night, I could almost literally crush walnuts with my bare hands. Even with that amount of strength sometimes it was hard to keep control of the tool. For most jobs like this I would clamp the tool in a vise and move what I was polishing back and forth.
Gaily bedight, A gallant knight In sunshine and in shadow, Had journeyed long, Singing a song, In search of El Dorado