I almost can’t believe that it is 1 inch deflection. You might be scoring the
stern tube. Or worse yet, you might be trying to rip it off the hull.
Where does it deflect that much (prop end, between the cutlass bearing and the
hull, inside). I would hope that the cutlass bearing does not let it move
sideways so it has to be one of the nodes on that deflection. The motor should
not move that much either, so the transmission end (coupling) should be another
(?).
My first bet would be that the shaft is out of true.
Marek
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