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Mine was spitting out shaft keys every hour of run time, so things were obviously out of spec on my old coupling. The new one is not going to budge without some effort.
The usual way to do it is to get some longer coupling bolts. You insert a socket or washers or something just under shaft diameter between the engine coupling and shaft coupling, then you tighten the coupling bolts back up. This will press out the shaft as you tighten it. Switch to the longer bolts once you have a socket in and keep adding washers until it presses the shaft all the way clear of the coupling.
Its an easy job until you start dropping stuff into the bilge.
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