Cap one end of the socket with balsa. This prevents glue from getting in the end. If this if for gotten, the core will likely need to be trashed as there is no way to remove the glue so the tube will fit all the way to the end. The tube must be long enough to go through the socket to just outside the false rib. About a 1/4 or 1/2 inch will do. So be sure to cut the socket long enough extend through the false rib to accommodate the tube.

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