[mmcintee1985@gmail.com]

There were a lot of different styles over the years.  I had a boat from that vintage and I remember I had to remove/destroy the part that was covering the access to the arm/shaft.  After that I was able to get a small puller on it and get it removed.  That was a long time ago, and from what I remember, the shaft was knurled and the arm was really on there--it may have been a spline but my best recollection is a knurl.  It wouldn't shock me if you had to slit the arm to get it off if yours is this same style--that's how fused together the parts were.

That’s kind of what I was thinking and unsure of the availability of replacements if I grind it off. But based on what you’re saying if it’s a knurled post then most likely it is held on by a retaining clip. This is what a previous poster mentioned. So I will need to take a better look at the underside of the arm where it attaches to the post.