I'm trying to mirror one flange over a plane so that it will match the other side. No luck. The idea is to make a longer flange, and then use an extruded cut to make the flange an almost perfect fit. I'm designing this way so that the radius can be changed in the future and the flanges will _hopefully_ update correctly. Much better than having to edit each flanges angle and length each time I change a radius.
So, here's the one flange that's been cut. I cannot get it to mirror. I've had luck with similar features before. Not sure why? File is attached.