Alright, ladies... I've discovered a wonderful new device... ahem... W does a lot of lifting at work, and needs back/neck/shoulder rubs almost every night. Back when I had a 390 lb. grip, I could give massages for hours; the arthritis has cut it down to a couple of minutes. Considering how many Spinbrush toothbrushes I've disassembled to get the motors, I can't believe that I never discovered this until this morning. When you just remove the head with the bristles on it, you're left with a very rapidly moving piston exposed. It gives awesome massages, but you might want to attach something like a pencil eraser when using it on bony areas like elbows. I suspect that brazing a tungsten carbide tip to it instead of an eraser might also allow it to function as a low-power engraver. For someone with sore muscles, it might be worth shelling out the $7.00 or whatever to give it a try.