Drilled a hole for the pitot tube mast. Started by using a uni-bit to drill two large holes. Then used a dremel tool with a stone grinder to shape the hole. Finally used a scotch-brite wheel to polish the hole. After fitting the tube through the hole, clamped everything into place and drilled the holes for the rivets to hold the mast in place. The holes along the spar aren't countersunk, The ones near the back of the mounting plate will be countersunk and the holes in the skin will be dimpled.
