PISTON STOP. I made this sometime around 1974 and have had it ever since. Remove the battery ground for safety, remove the no1 plug. Determine that the piston is "down some" and screw in the stop. Carefully wrench the engine CW until the piston stops on the device
Make a visible temporary mark on the damper exactly below TDC on the plate
Wrench the engine CCW until the piston again stops. Make a second mark as before
Now you have two temporary marks, and true TDC is halfway in between. If the factory mark is correct, that is where it will be
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