4 Piece Clock Mainspring Let Down Tool Set for Safe Clock Repair and Winding 3.5-5.25 mm

This 4-piece clock mainspring let down tool set is a must-have for any clock repairer. The set includes a handle and 3 chucks that fit mainsprings from 3.5 mm to 5.25 mm in diameter. The tool is easy to use and allows you to safely let down the power on a clock mainspring before repairing it. This prevents the mainspring from unwinding too quickly and causing damage to the clock.