I remember seeing/ reading a thread on the classic mako site where the last 18" to 20" of the stringers were rotted on an old mako. he took the dimensions on the core and made a mold out of waxed wood. Laid up glass around the mold,let it cure and removed the wood and bonded that for the last 3 feet, then drilled small holes in the top and poured foam for filler. foam was not structual, but kept water out of the void...
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