A defective harmonic balancer can affect the accuracy of ignition timing readings or a defective harmonic balancer can damage the crank. Which technician is correct?

Nick and Lemmy check out a flex plate from an imported Japanese automatic transmission with very few miles under its belt.
Throw a set of these resettable “fuses” in your toolbox.
A defective harmonic balancer can affect the accuracy of ignition timing readings or a defective harmonic balancer can damage the crank. Which technician is correct?
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