Using non split point drill bits drilling lens attach holes using holes in skin as reference. Drilled out holes #40 then #30. drilled to 5/32 and then Counter sunk the Plexiglas to accept dimpled skin.
Drilled out retaining brackets and counter sunk for nut plates. Scuffed and alodined. Installed / riveted nut plates to retaining brackets. Had to drill out 3 rivets standing too tall.
