One of our favourites is the clock shown on this page. It’s a simple build from an old rear truck brake rotor/drum and used spark plugs. The clock is powered by a quartz battery mechanism and uses 18-gauge steel hands. A mount for the mechanism was fabricated from 18-gauge steel and TIG welded into the brake rotor. Several coats of clear lacquer bring out the patina and wear on the piece which must have covered tens of thousands of miles in its previous life.