You can break or wear out just about everything on your mirage drive...
It's common to break:
Masts
Drive cables
Idler cables
Idler wheels
It's also not as common to break:
Crank arms (like burt said) I have broken them before...
Splines
It's not common to wear out:
Spline shafts
Drum shafts
Drums
Damn Tony. Think you just talked me out of getting a Hobie.
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