I make a lot of models and since I am always short of cash, improvisation is the norm. So trying to sand a new coat of primer in the tiny crevices of a model I had the brain wave to use an electric toothbrush as an orbital sander. 5 minutes later, success!
This works so well and with disposable toothbrushes being so cheap, I have several of them with different grades of sand paper pre-bonded for different jobs.
Step 1: What you need.
An old toothbrush (preferably your own)
Some form of contact adhesive
Heavy duty scissors