To make your rubber chock, start by cutting a piece of rubber about 1-2 inches in diameter. Cut the bottom of the rubber wedge so that it has a flat and smooth surface. Place the wedge on your fabric, making sure that the end of the Rubber Wedge is facing outwards. Now use a circular saw to cut a hole in the center of the Rubber Wedge and then insert the rounded end of your saw blade into the hole. Turn on your saw and hold the Rubber Wedge hanging over its free edge. Make sure both ends of the Rubber Wedge are facing towards you and use twisting motions to create a V shape with your wedges.
