Unless you're dead set on making all this perfect, I'd recommend more of a phased approach. First make sure you understand how the system works and the purpose of each part (see FAQs on this site). Then start by removing the cams. Next you should be able to pull out the plungers and springs from the hole in the top of the casting (without removing the delrin screw {plug} that is below them). (A little dishwashing soap will help lubricate and break up crud that may be holding the plunger in.) Then clean everything up really well, including the inside of the casting. Unless there is damage to the springs and plungers, they probably don't even need replacement. If anything, newer springs will be stiffer (more likely to lock rudders too tight). Further, if the cam tension was right before all the neglect, you may not even need to replace the delrin screw.
Reassemble with new cams (plungers and springs, if needed) and apply a dab of white lithium grease to the plunger and cam surface where they contact as the rudder goes up and down. You might be surprised at how much a good cleaning, new cams, and a little lubricant will help.
This is not the optimum fix...your castings will still be stuck to the boat and you won't be able to adjust cam tension. I'm just offering it case you might want a possible easier solution for the short term or for a vacation house boat that won't see a lot of use. Even if it doesn't work, you haven't spent much time, effort, or cash that you wouldn't have spent otherwise.
_________________ Jerome Vaughan Hobie 16
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