Join Date: Feb 2008
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I had an almost identical problem, except with the electrical grounding plate. I noticed it weeping last year, tried a quick fix (which for some reason is never quick, and never seems to fix anything) and decided to fix it this winter.
It turns out that the blocks were pine or fir or something, and were pretty wet and soft. I replaced and bedded the new plate and used teak backing blocks, end of problem.