Buy clutch here https://amzn.to/1aVKZIz
Video of thoughts about Harbor Freight engine
Crankshaft hex bolt needed to mount clutch is grade 5 or 8 and the size is 5/16-24 x 1.5″ or buy it here https://www.bmikarts.com/516-24-x-15-Hex-Bolt-for-Crankshaft-_p_796.html
Full length tool operation guide.
The only 2-in-1 air tool with a FLIP. Run the nuts down in high speed then flip the arm forward and press the safety lever on the back with your free hand to apply final torque up to 3,100 ft-lbs! Simple, Fast, and Safe.
Learn more at www.hytorc.com