Reply To: condition of jewels????

[david pierce]

Watchthebear,
The holes in the jewels and the pinions must be cylindrical. Any geometry other than this will cause problems. Any chips or cracks in the jewels are a problem. The cylindrical portion of the pinion must be the only thing that rides in the cylindrical hole in the jewel. A cracked or chipped jewel can cut into the pinion and cause it to wear in an uneven fashion. The best way to spot these issues is with a microscope.
david