Cut the coupler parallel to the shaft using an angle grinder with a cut-off 
wheel. Try to cut into the key so yuh don’t damage the shaft.  I didn’t have 
enough room to get all the way among the coupler with the grinder so I used a 
multi tool to finish the cut. Then pound a cold chisel into the cut to spread 
it off the shaft. May help to cut part way though on the other side.  It is a 
pain but doable - at least it was on my 34. 
Then get a new coupler fit and faced. 

- -
Nathan Post
S/V Wisper
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