I have searched the threads and have come up with nothing. I have made some custom mullions that are used for tile in a sloped glazing system. They work pretty well, but at the ridge I need to make a corner mullion so they intersect correctly. I made a half circle first but it sits on one side of the grid line, so I made a 1/4 circle and, but there is a gap. I have attached a couple of images for clarification. Thanks for any help.