Prop zinc for ps37

[discoverer37]

Does anyone know what is the correct prop nut zinc for the PS37?
I'm not near the boat and was hoping to get one before I return, but I'm confused. I have the original, standard fixed three blade prop, and the dimensions on the Martyr web site would suggest the correct size is CMPN-C
But, I have one of those, and I thought I tried it and it was too big.

Thanks,
Paul Hill
PS37 #135

[Fstbttms]

Prop zinc size is determined by shaft diameter. The correct zinc for a 1" shaft is the "C" size. If you are positive that the "C" zinc does not fit on your prop nut, either you do not have a 1" shaft or some other change has been made that requires a different prop nut.