Jak,
I read your post, and to me what I heard was 30 year old parts... no longer in good condition... how do I rectify them.
For me at 30 years old unless a part is unusually expensive, which would justify perhaps x-ray analysis of other extrodinary tests to ensure they are still good, I would just replace them and write the manufacturer to compliment them on makeing a product that stood the test of time. Particularly in light of the fact that it is normally recommended that standing rigging be replaced every 10-15 years or so, your parts have gotten an extrodinary life span.
If I had to reuse them... there are a number of companies that can sand blast and re-galvanize parts, they normally charge by the pound with some minimum charge of say $100. The problem with this in your application however is that you can't be sure about the fatigue limits of the parts you are trying to repair.
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