Let Down Tool
Use this clock mainspring let-down tool to release the power in a wound up mainspring. This tool works in conjunction with the key that you wind the clock up with.
The key goes into the chuck and the chuck goes into the handle. This is how to let the power 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 you take apart a spring driven clock movement without letting out the power of the mainsprings, bad things may happen. The movement could sustain damage, or it can severely hurt the hands or eyes. So for these reasons always release the mainsprings power before doing any type of work on the movement.