On 6-04 it says to countersink the doubler that connects to the spar. It shows in figure 2 the VS-410PP using 426 rivets but they seem too small to countersink. Do I countersink them?
Also, there is a big area in figure 2 that says "flush head on forward side", but if I countersink on the forward side I'm countersinking into the spar which is thin also, and the directions don't say to countersink or dimple the spar. What am I missing?
Also, there is a big area in figure 2 that says "flush head on forward side", but if I countersink on the forward side I'm countersinking into the spar which is thin also, and the directions don't say to countersink or dimple the spar. What am I missing?