I once, when I was about 12 or 13 made a transformer from scratch. It didn't turn out to badly, but the faults that it had were embarrassingly easy to trace to

I once, when I was about 12 or 13 made a transformer from scratch. It didn't turn out to badly, but the faults that it had were embarrassingly easy to trace to my own impatience. I learnt that winding transformers, like sewing, welding and many other skills, is a diabolical combination of high motor control and extreme patience if you want to do it well. I have huge respect for anyone who can do things like this.