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I submit, for your amusement, Speedmaster ref. 3870.50

The Doors Legacy box set.

Enjoy

give this man an award !

Just the tip, just to see how it feels...then we'll talk about using the whole tool

Really? You're kidding right? You buy it and then come here to see if it's real? Sent from my iPhone using Tapatalk

Ssteel got there before I could, you'll be in good hands mate

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Still in Bangkok motherduckers...

Mmm... Nothing beats a Laphroaig on a cold day.

I think the first think you need to do is get the balance wheel with attached hairspring out of the way. You don't want to damage that any further Put a piece of rodico under that fine regulator arm to hold it in place while you remove and turn over the balance c ock. Then you need to unscrew the stud retaining screw that holds the hairspring stud in the balance c ock. That's the screw at the 7 o'clock position in your photo. only turn that screw half a turn at a time, until the stud is released. You do not want that falling out! Where the terminal coil of the hairspring passes through the regulating pins, the 2 brass pins at the 8 o'clock position there is usually what's called a 'boot' that sits across the 2 pin to prevent the hairspring from jumping out of the pins. This 'boot' will rotate. They sometimes have a tiny slot in the top to get a screwdriver in, they sometimes have a hole in the side to insert a tiny needle etc. or grip it with a pair of tweezers and turn it a quarter turn and lift out the hairspring. Remember to do the stud retaining screw up as soon as you have the stud out. I can't help you with the refitting the regulator arm as I haven't done one yet. But get the balance and hairspring clear first Good luck.

After reading this I am glad I am not a dealer ;-) Glad in the end it worked out

The problem we are going to repair seems to be quite common in the A7750 movement. As the video shows, when you manually wind the movement, the rotor spins: