CASE STUDIES Coldur-A® Wooden yacht keel bolts Andrew Edmonds, the proprietor of Compass Marine Yacht Surveys, was tasked with the almost complete rebuild of a 35m long wooden motor yacht dating back to 1942. When Andrew ?rst surveyed the vessel he recommended that all the keel bolts be replaced as many were no longer visible or were very weak. For this application, Andrew speci?ed Coldur-A® from Columbia Metals. Keel bolts hold together the boat's wooden keel and 'hog’, or the backbone of the vessel, and fasten this to the frames and bulkheads. The hog is slightly wider than the keel. Both are original and made of Scottish larch wood. The keel bolts will also secure scarph joints between the lengths of wood that form the hog and the keel and to fasten bronze propeller shaft brackets to th

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