Method and device for marking trim miters for a bull-nose corner

A device for marking trim miters for a bull-nose corner which fits against the outside diameter of a bull-nose corner essentially defining about a ninety degree angle comprising:

• a cross piece which comprises an essentially rectangular member having a top edge, a bottom edge, a right side and a left side;
• a right mid-section which creates an approximately 135° angle with the right side of the cross-piece, which right mid-section is essentially rectangular having a top edge, a bottom edge, a right edge and a left edge, which left edge of the mid-section is congruent with the right side of the cross-piece;
• one flange having one edge congruent with the top side of the right mid-section and lies in the same plane as the right mid-section;
• a left mid-section which creates an approximately 135° angle with the left side of the cross-piece, which left mid-section is essentially rectangular having a top edge, a bottom edge, a right edge and a left edge, which right edge of the mid-section is congruent with the left side of the cross-piece;
• a second flange having one edge congruent with the top side of the left mid-section and lies in the same plane as the left mid-section;
• wherein the top edge of the first flange extending beyond the top edge of the cross-piece and the top edge of the second flange extending beyond the top edge of the cross-piece, so that the top edge of the cross piece and the inner edge of the first flange and the inner edge of the second flange create a u-shaped space, the perimeter of said u-shaped space defining a marking guide which can be traced with a marking device to create markings on the bull-nose corner to indicate where the trim should be placed.