DIYers all know about using a Dremmel, but sometimes what you need is a bench sander. Suppose you don’t have one? Well, just use an old hard drive. It turns out they make a pretty handy bench sander. This DIYer opened up an older hard drive, removed the read head, and added a piece of cut sand paper.
Yes, it doesn’t seem like it would do much, but check out the video below. Just hook it up to your bench supply and you’ve got a small sander ready to use.