Had to get to the hangar early for a camper rental dispatch so did some more work with the drill guides for the G3X. I took the top skin off for access, drilled out three rivets on the battery cage, attached a drill guide there and match drilled #30 holes. Moving over to the F-00074-L-1 DRILL GUIDE, progress was much slower. I got one or two holes drilled - eventually -- but the work hardened and progress was non-existent. I got frustrated so gave up for the session.