It is not necessary to plug and re-drill watch pivot holes when they are worn. Purchase some watch bouchons. These are brass pins, turned true and drilled accurately to centre. Select one that will nearly go on the pivot. Put it in a pin vice, and very slightly file it tapered. Then open out the pivot hole with a broach until the bouchon can be hammered in tight and broken off. Pile it level with the plate, and smooth off by stoning. Then open it out to fit the pivot. This method leaves the depth unaltered.