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I am getting ready to launch B29 hull #22. Bought her last fall and she had been sitting for a few years, but cared for previous to that; so things look OK. I have a dounut type zinc for the prop shaft; but it leaves about 1/4 inch of clearance to the rubber seal for the cutlass bearing. I assume that there will be enough room for water to circulate and lube the shaft. Any good solutions??