Electronics, Mechanics, building stuff, 3D printing, salvage parts from junk then use them to diy a home made just about anything.
I use a lot of tape, wire, zip ties, foil and other every day items to build just about anything.
Sometimes I also do it the proper way with proper tools.
If your looking for a quality bought one. Your on the wrong channel. If I can't fix it with tape and wire, its broken, you need a new one (can I have the old one for parts?).
There are also a ton of blocking oscillators and low power energy harvesters here. I