Countersunk for nutplates on F-904A&B fore and aft bulkheads. Riveted the nutplates to the bulkheads. Riveted F-904C uprights to the forward F-904A bulkhead.
Milled 1-7/16" spacer blocks from hard maple with planer. Started holes in the blocks by match drilling using close tolerance holes in center section bars as a guide. Didn't go all the way thru. Began finishing the thru holes and opening them up to oversize on drill press.
