My wife had a clapper switch on a floor lamp, somehow it stopped working. She asked me to fix it or get another one. Testing showed there was a two and a three-clap outlet, it was plugged into the three-clap outlet, we didn't know there was one. Solved.
Next up, was my back-up camera for the trailer, it had fallen off and dropped a few feet so something broken seemed obvious. It needed a solder joint under its battery connection.
Since I was getting cocky, I tied into my old Craftsman C3 flashlight that had been dropped. I had bought a new LED bulb for it but no dice. While looking under the bulb socket there was a melted connection, I robbed the springs out of two ink pens and made a replacement part, after assembling it 3 or 4 times it's working, not as bright as before but hey it's working.
Last up was one of those as seen on TV three panel LED lights in the front garage, I took it apart and didn't find anything that I could repair so I tossed it, got a one to two-bulb adapter and screwed in two old LED bulbs that were too bright for in the house.