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One day, my son was concerned that a chair of his was wobbly. We looked at it and he helped me isolate the problem: One of the screws was loose. I found one of our many leftover hex wrenches and showed him how to screw it back in. After that, he was curious what would happen if he screwed the other way, which he did until the screw came out. We ended up taking the chair all the way apart and putting it back together a couple of times, often mismatching pieces, before he was satisfied the job was finished. Try something. See how it works. Try again.My dad and I did this too! Not the chair, but things like it.
One time he gave me a sock full of shaver parts and said "I took my shaver apart and can't figure out how to put it back together. Can you see what you can do with all these parts?" It took a lot of experimenting and trial and error, but I managed to get a working shaver put together.
TVs had tubes in those days (not just the picture tube, but a couple dozen tubes in the circuit). As the tubes burned out, the TV would "go on the fritz". So I got to pull all the tubes out, and we drove down to the corner grocery where I plugged them into the tube tester, set the dials and checked the meter readings to find the bad one. We went home with the replacement, put the tubes back in, and the TV worked again! For a while.
Mom liked to sew, so I got to be the sewing machine repairman, cleaning and oiling, untangling and threading the bobbin.
Then I went to kindergarten where I had fun pranking the other kids and the teacher. For show and tell I brought a big fat electrolytic capacitor that I'd charged up at home, and a screwdriver. I told them what capacitors were and how dangerous they could be unless they were discharged. Then I "accidentally" touched the two terminals, one with each hand, and pretended I was getting electrocuted.
I somehow managed to break free, and then shorted the screwdriver across the terminals with a big spark and a loud and scary pop. I put my hands on the terminals again, smiled, and said, "It's discharged. It's safe now. You can try it." And a few brave ones did.
What I didn't tell them was I'd only charged it up to six volts!