In the early 1970s I started a business making cast motorcycle wheels. I got a bank loan to buy an hydraulic tracer for copying the rim profiles. An incredible device which sure beat the manual machining and form tools that I had used until I saw the light. I had different templates for different width rims. The tracer could follow the templates to half a thou. One of the best business investments that I ever made.
I have no pix of the tracer but here is one of the wheels showing the rim profile.
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