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I have a 1965 columbia 29. It is cored with... of all the things they could put between fiberglass... guess what they put. FIBER GLASS! I've put in a port this summer in the forehatch and it was solid, no core. The previous owner put in additional through hulls for **** pit drainage and it's solid there as well.
You will probably find that there is no coring to the Challenger as well.
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