It's something I want to learn how to do. My boss doesn't think the old machines are worth re-wiring. He doesn't want to do it. So he usually tells the customers, he won't do it. We fix cut wires with connectors and electrical tape, when the customer doesn't want to pay for a new foot control. But some of these machines don't have any insulation left on the wire -- that's when it's dangerous. I can solder a new capacitor into a foot control, but no one has ever taught me the right way to do it. The local tech college has a soldering class, that I'd love to take. Maybe there's a class near you.