It was time to change the belt on my sander. While I was at it, I decided to pimp it up. Here's my minimalist approach to attaching a solid, square fence to a portable belt sander.
Step 1: Portable Belt Sander
I bought this sander a few years ago from Harbor Freight. There was a dizzying array of models to choose from. This one had an adjustable handle. When laid flat, the sander can be laid on its back, and it's quite stable. I figured I would convert it into a bench sander, and this feature would save me some work. Even if your belt sander does not stand on its own, this instructable may still help you to attach the all-important fence. See, the fence must be square to the belt if you want to create and/or retain nice, square edges.