• Would it be possible to do something like this where the bolt is through the center part?

    Yes, there doesn't seem to be anything problematic there.

  • If you can do the middle I can do the sprocket teeth as I already have a parametric model for drawing any size and type of sprocket or chainring. If you're using a tool with dimensions this is the target, but as long as the OD is twice the ID I can scale it.

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