Many thanks for the suggestion. The video was really instructive and interesting.
Now I now that placing back the jewel involve a jewel press (Favorite or Seitz).
But, do you belive that also the following tools are needed?
Honestly speaking I cannot find them anywhere: I don't even know the correct name they have , in order to look for them properly.
The Mark's ones seems old and valuable…..
I'm giving a plug for those in the UK (No commission or personal gained involved) for Allendale Ultrasonics. They have always been very helpful to me providing good customer service and advice. They sell a full range of everything Ultrasonic including cleaning fluid. As far as watch cleaning is concerned they advised me to use small glass jars with 10% fluid 90% hot water which I have used with good success. The glass apparently has no effect on the cavitation process and obviously avoids filling the tank with cleaning fluid. Transfer with tweezers to another jar with water to rinse. Hope this might help someone.