I could not find a test wheel anywhere, so, decided to get creative...
Took a 9/16ID hunk of pipe, a deck mount for a 1/2" pipe, then centered and screwed it to a 6.5" Skill saw blade rated for 8400RPM. It holds the engine to 7400, does not cavitate and balanced very easily on my lawn mower blade balancer... total cost, $23
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