Irwin 27 1970 Compression arch

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Nov 29, 2012
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Irwin 27 Chesapeake
I am replacing my main bulkheads and have already removed mast and bulkheads. Evidence indicates that compression arch is also suffering from 42 years of slow water leak at mast step. I plan on cutting open the cabin head liner and replacing the compression arch. Does anyone know what the origonal arch is made of, how it is constructed...what I will find when I cut in?
 
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