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.
| Weight | 0.3125 lbs |
|---|---|
| Dimensions | 1 × 2 × 4 in |

I lost the screw for the folk for my kundo 12″ 400 day clock. Do you sell this part either with a kit or separately?
Thank you, and I am very thankful for your assistance.
Vincent
We have 400 day help and troubleshooting at this link
https://www.clockworks.com/clock-repair/clock-repair-help-1.html
We have suspensions and parts at this link
https://www.clockworks.com/clock-parts/400-day-anniversary-clock-parts.html
James Stoudenmire
40yr Clockmaker
Author of Clockworks.com
The key doesn’t fit into the chuck. What exactly am I supposed to do?
Please either order a different standard sized key, or send the tool in with a note saying you would like to order the 4pc let down instead
James Stoudenmire
40yr Clockmaker
Author of Clockworks.com
The let-down tool came with the 400-Day Kit. A different let-down tool should have been an option with the kit. If I return the tool, would you send me the 4pc tool for free?
Sure, send back with a note please
James Stoudenmire
40yr Clockmaker
Author of Clockworks.com
‘If someone were to take a spring driven clock apart without letting down the mainsprings, bad things may happen. The movement would get ruined and you can get your hands hurt.’ Tell me about it, my hand still hurts after the spring got away from me as I attempted a letdown. Use this tool!