Check the listing for details. Donkey Cone Garage Door Torsion Spring Winding Tool. Condition: New. Listed at 341.53 USD. Donkey Cone is a 2 piece coupler made from 60/61 heavy-duty aluminum that fits onto a 1 3/4” or 2” spring winding cone secured with 2 fasteners. Donkey Cone converts a standard 4-hole 90° winding option to an 8-hole (45°) option, allowing for the safe addition of or removal of tension on a garage door torsion spring in situations that don’t allow the use of industry-standard 18” winding bars. No truck should be without one! BENEFITS: The most important benefit is safety. It will prevent injuries caused by traditional methods of using “short” bars or having to remove/reinstall top sections of doors to adjust torsion springs. Efficiency. The Donkey Cone can turn a 2 technician job into a single-technician job saving an owner man time and money. USES: Low ahead Room (LHR) Damaged or broken winding cones Weighing doors Back winding torsion springs in “cable off” situations Has slotted marks every other hole for easy counting of 1/4 turns Works on all 1″3/4 to 2″ universal winding cones PRIMARY USERS: Garage Door Company owners, managers, and technicians Garage Door Wholesalers Garage Door related products/ tools