I suspect that former owner mixed and matched parts that would work on Alphas to Bravos in order to save $$$. Attached are photos of main drive input shafts. One has 4 O-rings, while the other 2 0-rings. The 2 o-ring shaft fit a later style Alpha coupler that had a longer snout with a grease fitting. Unfortunately, the lack of the 2 forward O-rings will allow spline grease to back out of coupler snout. The 4 o-ring shaft fit an older Alpha coupler that didn't have grease fitting or long snout. So the 2 forward O-rings seemed useless with that short coupler? I have since replaced the older Alpha coupler with the newer style. Rick helped identify that the older style coupler may have warped due to rotten transom fatigue. (I couldn't get spline tool to align motor correctly.) Nonetheless, should I remove the 2 forward O-rings? Do they really matter since I routinely maintain motors/ods? The threads on both couplers match both splines.
