Abstract: The device (9) has a pair of rounded triangular ends 8 mm thick (10) joined by a wooden handle (12). One side of each end is cut out to 3 mm, depth (13). This is the side of the end which rests on top of the ruler. The other side of each end is flat (14). The ends are connected by two strips (15, 16) 6 mm thick. Perpendicular to these strips are (2) reinforcing strips (17, 18) 6 mm thick. The strip (16) is affixed to the bottom of the flat side of each end to form a step (16). This is the strip which rests on the outside of the ruler. The strip (15) affixed to the bottom of the cut out side of each end. This is the strip which rests on top of the ruler. The underside of both strips have rubber feet affixed to them at 5-10 cm intervals. The handle (12) is 4.5 cm above the ruler (8) in order to enable visibility of the position of the fabric edge (7) and the ruler (8). The transparent quality of the device is a vital quality to the user.