Adding one more reply to Fred's question - For us removing the donut collar was very difficult. The set screws likely had mangled some threads and this caused threads to seize / shear within the collar when unscrewing it. Our collar appears to be stainless steel, so definitely a difference from the brass/bronze Ed on Prime Interest says his is. Eventually what did it was a very large pipe wrench hit with a very large hammer (with help from Lee on this list). The pipe wrench scratched up the collar a bit but there was no avoiding this as rubber padding attempts didn't have enough grip.
Like Paul, removing the radial drive was also difficult. The 4 bolts were seized but I was able to unthread 3 using a large ratchet with a DIY breaker bar (pipe extension). The 4th bolt got rounded off at the bolt head so I had to cut it off with a dremel. The rest was easier than Paul's experience though, the two halves came apart with some hammering of a small wedge. My writeup is here: https://svviolethour.com/2016/05/03/this-years-haul-out-dropping-the-rudder/ -Patrick 1984 LF38
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