I use a heated piece of music wire, I drill a hole the size of the wire in a scrap piece of wood sheeting, this is screwed to the work bench at the elevation that I need the hole. Heat the wire with a propane torch and slowly turn the wire into the wing core, I use a variable speed drill to turn and push the wire into the core. Don't overheat the wire as in will melt a large hole in the core.
Tony Hallo