How do I straighten just the inner hole of this mesh? I'm attempting to make a combination wrench. The hole is supposed to be hexagonal, but I can't figure out how to sharpen the edges without causing pinching on the outer side of the wrench when I use a subdivision modifier. Anyone have any ideas on how to do this?




I also tried beveling the inner lines of the ring that caused an artifact:
creasing edges with SHIFT + E could also be a non destructive option if you don't want to modify existing geometry