The previous chainplates were unserviceable as they were fiberglassed into their knees. The structure was compromised when inspected (and cut into), and they were also affected by crevice corrosion. Larger stock 316 stainless steel (1/4 in x 2 in) was used to fabricate new chainplates. These were mounted outboard on the hull (reinforced with 4 layers of 1708 biaxial fiberglass) after the old knees were cutout, increasing clearance for walking forward on deck, and decreasing loads on the mast.
sailing dawn treader 
I love what you did to the chainplates. I have the same problem if not worse. Do you have a video on what you did step by step? Where did you get your metal? How did you know it was stainless steel when polished?
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I was curious, the new Chain plates are 32 inches long or two feet? Nice job! Ill be doing this in the Spring
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