The very end of a 6v starter shaft (inside the bushing) is 1/2". Forward of that bushing, the shaft is 0.565+/-" (where the gear slides.)

More info on 12V vs 6V starters and flywheels HERE.


Kevin
1951 Chevy 3100 work truck
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1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car)
Busting rust since the mid-60's
If you're smart enough to take it apart, you darn well better be smart enough to put it back together.