TFL Caldwell breaks prop shafts

[Doctorplumb]

I purchased a brand new TFL Caldwell will Not even run a full pack without breaking the prop shaft every time(3), i’ve tried new bearings.

[1coopgt]

I'm guessing you have the washer and drive dog jammed up against the drive(not sure what its called) There should be a space between the washer and the drive at a minimum the thickness of the flex shaft. They shrink as you get on the power. Make sure the flex is greased well also.