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A piston stop should be soft metal and not interfere with valve movement so be careful making homemade ones. It's not really necessary if you're just checking to see if the balancer mark is close. Just rotate the engine until the rotor is pointing near #1 on the cap. With the number one spark plug out use a coat hanger to touch the top of the piston. Have an assistant slowly turn the crank until the piston is all the way up. The mark on the balancer should line up with zero or the pointer on your timing tab.
Have an assistant slowly turn the crank until the piston is all the way up. The mark on the balancer should line up with zero or the pointer on your timing tab.
You can turn the engine usually with 1/2" drive ratchet (5/8 socket i think). Put her in neutral and block the wheels. If you don't get enough leverage w/ your ratchet, put a small bar on it. It should be easy. Easier still if you take spark plugs out.