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It's hard to say without knowing the configuration... you mean just a flat plate? or does it slip inside the mast base...? If the mating surfaces are flat you could just put a thin sheet of anything from nylon to hpmw or whatever to isolate it. thin sheet material is available through Mcmaster Carr. They give a good explanation of UV resistance and strength too. In compression, I dont think you have any issue with crushing strength though...
If it's a painted mast, you may be asking for trouble though. Is there a reason you are putting stainless there?
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