It is pretty uncommon for the starter shaft to break. I would check your compression releases and see if they are working correctly.
Even if the compression releases were not working at all the starter shaft shouldn't have broken, I would think it is just a faulty starter.
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08 FLTR candy red sunglo,with 2015 103 HO, V&H Dresser Duals with Monster Rounds, Power Vision tuner, Willy Shiny Wheels and Forks and a bunch of other stuff.