Sure, I can spend $20 on a rotor truing tool. I'd also need to either drive to the store or wait for it to be delivered. It is faster, cheaper, and far more fun to make my own.
If you are interested, please see
https://rick.sparber.org/RotorTool.pdf
Your comments are welcome. All of us are smarter than any one of us.
Thanks,
Rick
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