I counter sank on the two F-856-1 spacers countersinking the #40 and #19 rivet holes. I countersunk the #19 holes in the F-843 lower longeron side webs that are common with the dimpled #19 holes in the side skins.
I countersunk the two #19 holes in the top web of the F-844-L auxillary longeron, that mount the F-883-1 fuel valve bracket.
I countersunk the #19 holes in the two F802D-L&R LG box plates, that are common with the side skins.
