Let Down Tool
Use this clock mainspring let-down tool to release the power in a wound up mainspring. The key goes into the chuck and the chuck goes into the handle. This is so the power can be let out of the mainspring. It does the same job as the 4 piece set that we also sell. However, this one fits over the existing clock key instead. If a spring driven clock was taken apart without the power being taken out of the mainsprings, bad things may happen. The movement could sustain damage, or it can severely hurt the hands or eyes. So for this reasons always release the mainsprings power.