The standard shaft for GRAVELY riders is 1.125" diameter, approximately 3.75" long, 1/4" keyway and a 7/16-20 tapped hole in the end of the crank. I may end up with a short chain drive. Then I could manipulate the RPMs if needed.
if you do go with the floor polisher motor The shaft is most likely 3/4" 1/4" keyway looks to be a 1.25-1.5 inches long on mine with a 1/4"- 5/16" tapped hole in end of the crank too early in the morning here to accurately measure he shaft mine. Looks to be a nice motor
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