Step 1: What You Need
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.
Step 2: Bolt the container
Drill a hole dead center of the container's bottom. Put the bolt through the hole. Thread the nut tight.
Step 3: Join the Container to the Electric Screwdriver
This is the most important step. The joint holding the the container and electric screwdriver should be strong and able to hold the weight of the assembly.
Put a little putty on the bolt first. Insert the bolt into the screwdriver's bit holder. Cover the whole joint with putty. The more putty the better the ball mill stays together.
Step 4: Clamp the Assembly to a Table Top
Fill the container with the screwdriver bits or with steel balls or lead balls. Add the chemical you need to grind. Close the container and clamp the whole assembly to a table top.
I use a popsicle stick to hold the screwdriver button down. I jam it between the clam vise and electric screwdriver (see video). But that depends on your electric screwdriver.