The Incabloc end stones are oiled and re-fitted to the blocs.
The balance/cock is now fitted. The fine adjustment regulator is centralised.
I noted in the initial review that the hairspring was not concentric. Additionally, it’s clear that the outer coil is closer to the other coils on the lower right (at the stud) than on the lower left so it’s significantly out of shape.
The hairspring should be central between the regulator pins and it may be seen to be hard against the inner pin due to the outer coil shape.
The hairspring is checked to ensure it’s flat and parallel to the mainplate which, in this case, it is.
Adjustments are made to return the hairspring to the correct shape and final small tweaks are made when the basic movement is complete. This leads to the final shape as below where the outer coil is now running centrally to the regulator across its working length and the coils are equally spaced.
The balance and cock are removed and the assembly continues with the mainspring barrel.