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Thanks for your very informative answer. I’m learning as I go – prior to working on this runabout my boat experience was limited to kayaks and canoes. This boat indeed needs a short shaft – its Transom to keel measurement is about 15 1/2 to 16″. It was my inexperience and convenience (the motor was sold by a neighbor) that led me to get the long shaft. What would be the commonality among other Evinrude 25 hp motors of that era for such parts as the standard shaft? I have a second motor, a 51-53 25 hp manual start motor Big Twin. If I acquired the standard shaft, what could I expect in complexity in swapping them out?