I have sang the praises of the Mastercraft watch mainspring Winder many times here. However one of the springs that hooks onto the mainspring broke and the spare winders hook was worn so I needed to replace. After a search on the net I found this company (UK) https://www.leespring.co.uk Well worth a visit if you require a spring.This company has a comprehensive selection of springs by size a torque requirements. This was my first attempt so don’t be to critical. I ordered a extension s