hi, i need to tap into your vast experience here. yes, it involves our old topic of cutting holes into curved surfaces. i've hit one that is going to cost me my last few hairs.

i need to cut the hole for the canon in the wing root. the first image is where the hole is supposed to go. second image is what i've cut. but image 3 shows the two "ridges" that formed. how to get rid of them?