to c show the catheter 10 includes an asymmetric forward cam face 40 on the cam wheel 22 and a symmetrical rear cam face 42 in addition the electrode tip assembly 16 includes asymmetric attachments of the left and right steering wires 56 and 58 to the left and right faces 78l and 78r of the main support wire 78 more particularly the right side surface 44 of the forward cam face 40 is formed with a radius of 0 3125 inch while the left side surface 46 of the forward cam face 40 is formed with a radius of 0 4062 inch the right and left side surfaces 50 and 52 of the rear cam face 42 each has a radius of 0 313 34 the right steering wire 56 is attached at the distal tip 88 of the main support wire 78 while the left steering wire 58 is attached about 1 5 inches from the distal tip 88 of the main support wire 78 when the steering lever 34 is rotated clockwise the foregoing relationships bend the main support wire 78 about 270 degrees to the right to form a looping 34 pigtail 34 curve when the steering lever 34 is rotated counterclockwise the foregoing relationships bend the main support wire 78 about 90 degrees to the left to form an elbow curve as fig7 a to c show the catheter 10 includes symmetrical forward and rear cam faces 40 and 42 on the cam wheel 22 in combination an asymmetric attachment of the left and right steering wires 56 and.