I'm big into powertools. I've lost a lot of sperm, playing with tools on my tool. This one has lately become my favorite.
I noticed that a paintroll tube is about the right size for my cock. I grease up my cock good and slide 'er in. I then get the portable sander, switch it on and go up and down the tube. I can't last long with this one. Feels great but doesn't last long.