Josh,
I do use a MacMaster shaft collar and it works well.  The problem is that the 
PYI shaft collar does not slide easily on the prop shaft, so I can't push it 
aft to compress the bellows.  Maybe some lubrication would help.  And I won't 
loosen the PYI collar again on haul out, as your experience suggests. 

But Jim - what is a zinc donut?  No idea about that. Is it edible? Ah, Google 
revealed what they are. 

Eric


> 'A regular zinc donut works well as a retainer, no need for fancy. It also
> provides insurance against the shaft sliding out backwards if the coupler
> and everything else lets go.
> 
> Jim Watts

> McMaster Carr has SS shaft collars which are relatively easy to install.
> These are used and recommended a a redundant holding device.  They could
> also be used to hold the collar until the grub screws were set.
> 

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