I got a double offset rivet hammer from Avery and used it (with the rivet gun) to buck the four AN470AD4-10 rivets at the corner of the baggage floors. This worked and the rivets were properly set. Riveted the 6 Baggage Ribs to the F-1204D Center Section Aft Bulkhead and the Baggage Floors. Dimpled and installed K-1000-08 nutplates to the two F-1221 Baggage Ribs.