This Breitling had a broken pusher (for operating the chronograph). The old pusher screw broke off at the thread and was made of brass which is not an ideal material for a screw under so much pressure. The chronograph reset pusher screw is made of steel and so the brass screw is obviously a prior replacement and not original.
A Swiss replacement was sourced, however, the screw head which normally would push against the operating lever on the movement was way too short.
To resolve this I manufactured a new screw using blue steel wire with the same profile as the replacement pusher screw and made the head to be long enough to push against the operating lever.
The following pictures detail some of the steps involved in executing the repair.