One boat that was forever doing this turned out to have a bad motor mount. 
Might want to check that…

From: CnC-List [] On Behalf Of William 
Walker via CnC-List
Sent: Tuesday, September 20, 2016 16:17
Subject: Stus-List Prop Shaft coupling

Some may remember that around mid summer I posted that my prop shaft had pulled 
out of coupling.  Mine has two bolts which go through coupling and into small 
dimples drilled into shaft.  They were wired in and over time the ends had worn 
off and allowed shaft to pull out when reversed was applied to prop.  Some on 
list checked and had similar problems.  I was surprised so many
Well, on haul out I discover it has happened again, with the new bolts.  
Haven't pulled them yet to see, but shaft pulled enough to show key and the 
dimples, still in place.
No excessive vibration or anything.
Bolts still appear tight.
Thinking maybe of going with two set screws in each hole, one snugged, another 
on top.
Love to hear thoughts from listers with some experience.
Bill Walker
Evening Star
CNC 36
Pentwater, Michigan

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