Review on Proform 66792 Dead Center Locater by Wayne Seba

Turn the motor with a socket and ratchet. Just keep in mind that if you put a lot of force on this bolt, you will bend it as soon as you feel resistance (like I did). I ordered another one and fixed it. tried again I put the locator in the #1 cylinder hole, turned the engine in one direction, felt resistance, marked the harmonic balance. I turned the motor in the opposite direction, felt a resistance, put another stamp on the harmonic balance. Halfway between the two marks was top dead center.