A 70 year old pocket watch repair man said you go into a drug store and go where they have nail products and a nail polishing buffing cube. I tried it and pics are attached. . As you can see the fine metal on the used buffing cube. This sample was use on a blue stock wire for pivots that was about 1mm in dia. Thought it was interesting so I thought I would pass it along. I strongly believe in this day and age where it is hard to find the master and apprenticeship connection that besides a full