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A site with useful data on spring-making - http://home.earthlink.net/~bazillion/matls.html
The diameter of the spring stock used in HotToys bipod extension springs looks to mike out at 0.010", you could cheat a little, but the HT springs sure look good.
Being an inveterate scrounger, I agree with the others that old and broken toys, cassettes, cameras, and players are great for small parts and springs. I haven't scrounged any so far, which replicate the HT springs.
The diameter of the spring stock used in HotToys bipod extension springs looks to mike out at 0.010", you could cheat a little, but the HT springs sure look good.

Being an inveterate scrounger, I agree with the others that old and broken toys, cassettes, cameras, and players are great for small parts and springs. I haven't scrounged any so far, which replicate the HT springs.