Harken 29mm Carbo Double Swivel Symmetrical Fishing Pulley [1214F]29mm Carbo Double Swivel Symmetrical Fishing Pulley Designed to improve the deployment and retraction responsiveness and the precise presentation of bait teasers aboard sport fishing boats. The unit features two back to back 29 mm sheaves, which make it symmetrical and balanced. This is the first fishing pulley with a swivel on both ends, where earlier models had a single swivel at the head. This eliminates the need to manually rig another swivel at