Clock Let Down Tools
The let down tools set comes with a handle and 3 chucks and fits just about every winder arbor size. Put the chuck into the handle and then release the mainspring in a slow controlled manner with the hand grip. This is done by putting the tool onto the key post arbor and then gently releasing the click. While doing this the fist is around the handle and the power can be let down with gentle care. Of course the opposite of this is to try to do this with the key and this usually ends bad for the persons hand and the clock movement.