Thor - look here:
http://www.martec-props.com/refurbish2.htm I pulled my engine this fall for rebuilding and also pulled the shaft. Since I was replacing the shaft seal too, this was a no brainer to remove the coupling and shaft seal collar. I rebuilt the Martec prop by getting a new pivot pin and cotter pins from Martec. This was done without removing the prop from the shaft.
Good Luck!
Bill #348