I just countersunk the top holes of the left elevator trim tab spar, and it has me wondering if I need to take a second attempt. While the holes turned out relatively round without a lot of the wandering chatter that I'd read about with such thin material, the holes are definitely larger than I was expecting. Maybe I went overkill, but by the time I countersunk to a point that the skin dimple would nest flush, the hole seemed huge! I checked, and sure enough, it's about 4/32" vs 3/32". I don't know how much of that is due to the thin material, or if maybe I got more wandering than I thought.
This spar gets sandwiched between the skin and trim tab hinge, so I don't know if the larger hole is expected and okay, or if I need to get a new part and dial it back a bit.
This spar gets sandwiched between the skin and trim tab hinge, so I don't know if the larger hole is expected and okay, or if I need to get a new part and dial it back a bit.