Clock Loop-End Mainspring Winder
Winder for loop end mainsprings, to be used with the mainspring clamps. This is to take a unwound loop end mainspring and wind it up to get a mainspring clamp onto it. When the C clamp is on, it is much easier to manage in the clock movement assembly process. There is not really a totally safe way to use this tool, it can be both dangerous and tricky. The mainspring can pack a punch so please take precautions to protect the body just in case it lets go.
Ideally one would use the great wheel in through the hole in the device, clamp it down in a way to protect the teeth of the wheel. Put the mainspring on it with the loop end of the mainspring over the arbor of this device. Use a mainspring key to wind the mainspring up on the great wheel that is clamped. When the mainspring is small and coiled enough put the mainspring clamp over it and release the power some so it is safely in the clamp. Now the mainspring is wound and easier to put into the disassembled movement to reassemble it again.