The chronograph brake (blocking lever) is fitted. This is a white plastic piece for the 1861 but in the previous versions of this calibre, it is a two piece metal part. It will hold the chronograph when stopped and not reset.
The coupling yoke will transfer the drive from the base movement to the central chronograph runner. It consists of these parts.
Jewels and bushes reviewed and they are fine.
As is the wheel and its pivots.
These are assembled and oiled – this one picture is from another watch as I forgot to take one here.
And fitted to the movement. It pivots about the upper “screw” which is actually an eccentric to adjust the depthing (mesh depth) of this gear and the driving wheel which is installed after this.
The coupling yoke wheel is powered from the extended fourth wheel pivot by this driving wheel which is pressed on to that pivot.
The teeth on this are fine as well.
And fitted to the movement by pressing on to the fourth wheel extended pivot. It can be seen that the driving wheel and coupling yoke wheel are meshed so when the movement is running both of these wheels will turn continuously.
The spring for the coupling yoke is then mounted.