I removed the turnbuckle. The mast is now vertical! Much better, and I have the range of adjustment that I recall.

The rotator assembly that I am familiar with looks like the photos that Gree#### and erice posted. I reread your description several times and it sounds like I could have a rotation limiter without the wishbone. I went out to the boat to see the hole, so what you are describing could explain why the front half of my boom seems to be upside down. There is a strap and cleat attached to it underneath. So what I am missing is a stainless rod/bolt with an eye on the end. Is this unique to the older 5.2s? I'll search for over/under rotation.

That black small mast ball looks like a shift knob to me. it has brass threads. The whole thing is getting replaced/updated. Thanks for the warning about the pin. I will be sure to remove it before flight. Right now the pin does nothing. Those photos were taken in the backyard, so no chance of sailing off from here.

The jib downhaul needs replacement, so it was not tied off correctly in the picture.

I was told by the previous owner that the hooks in the front deck were to secure the daggerboards. He has a shock cord attached to the top of the daggerboard that loops around these hooks as is shown in the 1983 Assembly Manual that erice posted. My 83 Nacra had the side loader system.

Thanks again for the help - Dean