Im trying to find a McGuard Prop lock for a 2008 Yamaha F90, they have a size for 115hp and up called a #74040 but its a M18x1.5, the thread is too large for my shaft.
They said they don't make one for the F90, but I find that hard to believe. They make a #74056 for a M16x1.5 , but its not...