Originally Posted by jls32
Dimple NOT countersink the forward face of the L/R Elevator spar E-702 for the 706/5 attachment. 702 is too thin to countersink and you'll end up with a hole larger than spec. THANKS VANS!!!! FIX YOUR **** INSTRUCTIONS!
FWIW, I asked them about this particular area. I suggested using NAS1097 instead, since they have a smaller head. I did not want to dimple as I wanted parts to sit completely flat (since there is this whole horn that mounts over them). I know some builders dimpled, though, and it worked fine.
The answer was to follow the plans, so I did countersink for AN426AD3, but I did it without a cage, manually, carefully controlling the depth. The E-702 is 0.032" and the "full" countersink depth for AN426AD3 is about that exact depth. So you do get a knife edge.
Either way, I don't think it matters much as this steel horn over these two parts won't let anything to move anyway.