Hi grumblers, I framed a piece of copper art mounted on art board (3/16"). We chose to put a fillet around the piece. Overall size is 20X46, opening is about 14x40. I cut and fit the fillet first around the piece, THEN cut the matt opening for the fillet with a reverse bevel. WRONG SIZE!!!OK, second attempt, size perfect, but there was a noticable bow in the top long cut. Never saw this before now. It is a perfect bow from corner to corner (1/8") The corners were perfect but the bow in the middle of the cut covered the fillet!!! Any ideas???? The cutter is practically new C&H 60" Pro-Advantage.Any ideas??? Thanks, Chuck T.