I made the F-741A-L&R Tunnel support covers and the F-741B from material as shown on DWG 30. I drilled holes in the lower flanges of the support only. These holes had to match the holes in the floors, so I measured carefully.
I then clecoed the supports securely to the floor and clamped the F-741B Tunnel Cover to the top flanges of the supports. I slid the cover forward until it contacted the slanted floor. I drilled and clecoed the single forward hole to the floor and checked to see that the edges of the cover and the support flanges were even, and then drilled the holes connecting the cover to the supports.
I riveted the tunnel cover to the supports. After this was done I removed the tunnel cover and forward seat floors and installed the nutplates in the seat ribs and around the stick cut-outs in the floors not forgetting the nutplate for the tunnel cover.
Time: 4 hours.
Leonard's RV-7A Build 