Maybe I'll just leave them on, but I thought of changing them after reading this:I am not sure that they are Incorrect.
I understand that the larger nut is the primary one. It is tightened to the torque spec, which often means tight (really grunt tight) to most Boat Marine Workers (compared to BMWs, as they charge about the same).
The smaller nut is the locking nut.
The Truth About Prop Nuts - And Why the Half Nut Goes on First — FollowingSeas
There are many boat owners, mechanics, and yard workers who do not install propellers properly. Here is what they should do and why it matters.
I thought it would be an easy switch though. I don't even know how I would torque them down to spec by hand.