Base movement assembly
Now all the parts have been reviewed and brought back to specification, where required, the basic movement can be assembled. From this point, the main checks are side shake (lateral clearance in the jewels/bushes) and end shake (longitudinal clearance in the jewels/bushes) – adjustments are made as required.
The barrel bridge is temporarily fitted and then the keyless works installed on the dial side. These interact with the crown to wind the movement and adjust the time.
After checking the mainspring, I decide to re-use it as the customer recently paid another watchmaker to replace this and service the watch. It is wound into the mainspring winder.
Then pressed back into the barrel and the barrel closed with the barrel closing tool. The end shake of the arbor in the barrel can be checked here and adjusted if required.
With the movement turned over, the barrel and centre wheel are installed.
Then the crown wheel that transfers the rotation from the crown to wind the barrel.
That’s accomplished by the ratchet wheel and click/spring, now fitted.
After a special treatment on the escape wheel, the remainder of the train is fitted.
And then the pallet fork with its special treatment on the jewels.
And finally, the balance is re-fitted – the base movement now runs.