I have an Irwin
43 MKIII (13 tons dry) that currently has a fixed 3 bladed prop. I have been looking for a folding or feathering prop. My shaft is either 1-1/4" or 1-1/8". The surveyor
measured one and the manufacturer states another. I need to check myself. I have successfully used prop/shaft shims on a fixed prop, so I might consider going that route
. I am not sure until I do some research
Once I get my answers and I decide if I want to pursue one of yours, I will get back to you.