Started countersinking the holes in the spar for the skin to spar rivets. The countersinks need to be deep enough so that the dimple wing skins sit flush. Vans says a flush rivet should sit .006 to .007 inches deep from the spar surface when the countersink is the right depth for the skin dimple.
Countersank the IB half of th RH skin lower spar flange. Lots more to go
Countersinking spar
Meausuring depthe of countersink with rivet in place
