I like really simple solutions to problems, and it doesn't get much simpler than this.
Step 1: Stuff you will need
2. Threaded rod they call it "all thread in some places"
3. Buffing and sanding attachments
5. Nylock nut
7. ruler or tape
8. about 5 minutes
Step 2: Choose your drill
Step 3: Measure the bolt
Step 4: Cut the rod
Step 5: Drill a hole
Step 6: Speed control
There are lots of different attachments that will fit in a drill, my favourite is the flat disc that you can put automotive double sided tape on and then you stick a round project to the disc and sand and polish it.
Now I can make some of those fantastic jewellery projects that Mrballeng makes