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Same as the one I made December 2015. Most people don't have a drill press so I showed how to make it using a handheld drill.
I am a piano technician but you can try piano supply companies or call a local piano store or technician.
I don't have any formulas, I would just make them and test them. I use them for jigs in my shop so it is not necessary. Smaller coils and thicker wire increases tension.
Thanks, now you know how to make them anytime.
Take the broken spring and copy it. Then you could make spring testing jig to test them. The smaller the coil the stronger the spring.
How to make springsView Instructable »