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Briggs Model 19 with Keyless Flywheel

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I have a Simplicity 725 with Briggs Model 19. It looks like the flywheel is key less. Is there a pin (item # 23850) that locks the flywheel in one orientation on the shaft. Then the large retaining nut goes on.

This pin and pin hole is my issue. It looks like the part is no longer available so what is the length and dia?


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