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Actually two questions. #1 What type of glue did the factory use in 1940 and 1941 when they built up their spars? The spars in question are built up laminated ones and appear to be seperating at the root end ! (Ican see the lines there only and the appear APPEAR to be opening(or open) more on the back side then the front. if one has holes or a hole towards the MIDDLE of the spar is it an approved technique to insert(glue in) dowles of spruce ?