That left how to spot weld. There are many YouTube videos showing how to do it with a commercial tool, but one vid showed a homemade welder that was little more than a motorcycle battery, push button, horn relay and some leads. I could do that.
I’ve had a small air compressor in the shop for over a dozen years, and it’s served me well. Inflating tires, brad nailers, blowing dust — even some small air tools — it’s been fine. I turned it on recently, and it sounded much different. It’s always been noisy being one of those oilless types, but this sounded much worse.