[hiccup]

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.