There's plenty floating around as NOS parts... google "Hobie 60450000" for the screw and "Hobie 10430000" for the spring. Murray's has them as well.
After removal, one of mine was reusable, IIRC -- and I cut threads into a 3/4-10 bolt and chased the casting threads to encourage happiness in the new screws. After filing, cleanup, and lube, my old-style castings release pretty well as long as the sliding surfaces are greased. I keep those screws loose enough that they matter little, and use bungee cord as the primary down-lock (well, at least beyond basic friction). In heavy wind and waves, I do need to reset the rudders to fully down from time to time, as they'll walk up a bit on their own... but the increasing weather helm is a good indicator of when that's happening!
I, too, treat my rudders delicately, as if they were manual, without auto-release/kick-up, hoping that if needed, the tuning/lubing I have done for auto-release will keep things happy. So far, so good...
Randii
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