Phil sent it over because it sometimes stops when the chronograph is engaged…
The case is solid, so the movement comes out through the front. The crown is split, and you can simply pull it out.
The hands come off.
Someone has replaced the chronograph minute hand with a non-original one that is way too thick – I will have to do something about that.
Pretty straightforward movement for a chronograph.
I start taking the chronograph apart.
Now I’m down to movement level.
Down to the wheel train.
I remove the balance jewels for cleaning.
The old mainspring, which will of course be replaced.
And here is the new one.
Reassembly starts with the great train. You can see the fourth wheel arbor sticking out through the jewel – this arbor drives the chronograph.
The movement is back together – without the chronograph layer which I will put together next.
This takes a while …
Now it’s time for the depthing of the chronograph wheels.
When adjusting the watch, I notice that I have problems in the dial up position. Checking the movement, I find out my problem is two-fold – the hairspring is slightly bent and touches the balance cock, and the balance staff pivots are worn out. On top of that, the balance is a bit wobbly.
I won’t attack the hairspring myself, but send it off to Howard Vyse to sort it out.
In the meantime, I change the balance staff.
I gently push in the new staff with the staking set.
Now I have to get rid of the wobble.
With a new crystal, I case the watch. Have a look at the small hands – can you tell the difference? 🙂
With abrasive paper and patience, I’ve shaped the wrong hand to the right shape…