1. A rugged container (You can use PVC pipes or big plastic bottles)
2. An electric screwdriver (these are fairly cheap, I got mine for $10)
3. A bolt, a nut and maybe a washer.
4. Epoxy putty.
5. Steel or lead balls which in my case I substituted with screwdriver bits that I got for $3.
6. A vise clamp to hold down your ball mill.