The hour recorder yoke (circled in red) may be seen to protrude through the dial side of the movement and moves towards the centre of the movement when the start pusher is pressed and this will release the hour counter brake (stop lever) that was fitted previously.
This is achieved by the switch lever which is now fitted to connect the two.
There is a dial support bridge at the upper that I prefer to fit at this stage and not earlier as the movement fits better in the typical movement holder when it is the other way up.
The reset pusher stem is fitted at the lower right.
And finally, the hour hammer spring that controls the hammer for the hour counter and the slave screw in the brake spring is replaced.
That’s the chronograph completely assembled and the remaining part to fit is the hour wheel/dial washer before moving on to re-fitting the dial. This and the chrono creep check are dealt with here.