I would suggest replacing the strut :
Driect drive MSP0010172 Strut,PropellerShaft,For1"Shaft,w/BearingBronze 17 19 154.22 $125.00 $30.00
vdrive model MSP0011189 Strut,PropellerShaft,For1-1/8"Shaft,Bronze 17 20 156.89 $125.00 $35.00
Remove the prop, remove the 6 lag bolts and replace with silicone to reseal and check alignment.