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Old 11-25-2012
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Re: "The chainplate will buff out and probably be okay"

I posted a while back about my chainplate experience - I took the headstay fitting off to polish - it looked fine but wasn't OCD shiny, as I require.

After buffing it with a 1/2 horse buffing machine I noticed what looked like a faint hairline scratch across the front surface of the tang portion below the welded portion. You had to catch the light across it just right to even see it. I buffed it some more but it was still there. I held it at both ends and pulled and it slowly bent like taffy until it snapped across that "scratch".

I immediately pulled every chain in the boat and made up new ones which I had electropolished.

Crevice corrosion can be VERY subtle.
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