This is the hour recorder runner viewed from the dial side. On this long extended pivot, the chronograph hour recorder hand is fitted. The pivots and teeth are seen to be good although a couple of scratches here due to careless handling. The upper one was probably added by a previous watchmaker to help with checking chrono-creep later on when everything is built.
And on the other side is the heart for resetting the recorder to the neutral position.
This part is the hour recorder hammer which will pivot at the bottom right. On the very left is the “hammer” which, when it strikes any place of the heart above will swing the hour recorder back to the position where the hammer is on the flat part of the heart. That is the neutral position.
The barrel has been temporarily fitted so that the driving wheel for the hour recorder may be seen to mesh with this runner. When the barrel turns, this hour recorder runner will also turn unless the brake is fitted and all are adjusted correctly. Also shown here is the hammer in a position clear of the hour recorder runner.
This is the bearing in the hour recorder bridge where the hour recorder runner will be supported – clean and without wear.
The hour recorder bridge is fitted to support the runner, hammer and the barrel.
Although these photos are from slightly later in the build, this shows the hour recorder stop lever in place. It can be seen to be clear of the hour recorder lever so is not doing anything until the spring is fitted.
Spring fitted with a slave screw and the stop lever is now held against the runner to stop it turning. The hammer spring is not fitted so it is loose.