Originally Posted by lawsonmitchell
I mean Beneteau, Jeanneau, Bavaria and Dufour to name a few all have metric setups, right? Just so I'm reading you right, You are opposed to the bore reducer bushing, Yes?
Metric running gear is very common. Nothing unusual about it.
While the bore reducer will probably work just fine, I'd be concerned about it insulating the prop from the shaft and the protection provided by the zincs mounted there.
There is no compelling reason to not use a prop designed to fit on your 25mm shaft.