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Lesson 8 -- Mainspring Disassembly 21 Jan 2007
Tools Required: Eye Loupe, Screw Drivers, Tweezers
Mainspring is the power source of a watch, there are 2 types of Mainsprings: Automatic Mainspring, Hand-winding Mainspring.
Mainspring Barrel Mainspring Barrel - Hand winding
Mainspring Barrel

Step 1.

Open the Mainspring Barrel

Put your fingers on the edge and press down.

Mainspring Barrel Opened  

Step 2.

Pick out the Arbor (right)


Step 3.

Pull out the Mainspring slowly and carefully.


Pay attention on the end of the Mainspring and the Barrel in green circle.

This design is for Hand Winding.

Watch Mainspring

Step 4.


According to the winding direction, place the Mainspring and the Barrel as shown on the left hand side.


Step 5.

Pick up the Mainspring without changing its direction.

Mainspring - Horology Zone


Put the Mainspring back into the Barrel.

The slot on the barrel should hold the Mainspring in position (green circle)

Mainspring - Horologyzone.com

Step 7.

Put the Arbor back and close it.


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