Today was more countersinking work. I machine counter sunk the inborad side of the #30 rivet holes in the F-817 L & R seat back support plates. These took longer than expected because when taking the fuselage apart after drilling, I put them in a place so safe, it took 15 minutes to find them :-) .
I counter sunk the #30 rivet holes in the lower longeron side webs that are common with the bottom edge of the F-891 L&R side skins.
Finally, I counter sunk the #30 rivet holes in the F-896 L&R side webs that are common with the F-891 L&R side skins.
