Task: Make a needle-valve retainer spring.
This is the little gizmo that goes on a model airplane engine needle valve, and engages the straight-knurled base of the needle to prevent the thing from vibrating around.
So -- I'd like to anneal, form, then temper. Any guidance? I've tried annealing steel music wire, and even though I'm pretty sure that it's just plain carbon steel, it's so thin that it tempers in air. How does one anneal thin carbon steel sheet? Or do you just try to draw it until you can bend it, then re-temper?
The spring needs to be a square "U" shape, with a hole in the bottom and the top arms formed into shallow "V" shapes to engage the needle valve knob.
Thanks in advance...