Marking my miter
This is how I mark the sewing line when I do a miter. I typed in a long explanation but hopefully the picture will do, seeing the computer lost it. My border is 5-1/4 inches and I left more than 6 inches to do the miter. I will interchange the borders and do the same line with my Frixion pen on the other border. I will then Draw my 1/4 inch cutting line beyond the sewing lines and trim and sew.