The caliber size was decreased by sharpening in order to fit the movement in a strange case.
So the pillar plate was filed to an oval shape. This oval shape with the destroyed edge is to bring in the original form. The edge is completely to turn off, a ring is to press over and to solder on with silver brazing. Afterwards the edge is to turn, to form, bore and mill to the origin shape.
The silver plating, frosted surface, gets lost and must be renewed later, is also valid for the gold plating.
Here in this case it is possible to treat the pillar plate in such a way as I mentioned before. The warmth while soldering procedure does change the hardness of the brass certainly nevertheless the remaining condition. This treatment, soldering, is only allowed because no rubies are set directly in the plate.