Originally Posted by frozenhawaiian
go to harbor freight and buy a pair of calipers for a few bucks and just measure the diameter of your rudder post.
Well from OP's post #1 "I'm not on the boat and can't measure the diameter of the rudder post."
And from post #3 "I am not on the boat, and won't be for several months. I wanted to make the tiller arm now so I can attach the parts
, the next time I am at the boat."