Originally Posted by
JohnDThompson
The "brassy" looking material is copper, which is used as a base layer under chrome plating because chrome doesn't adhere well to steel. The middle part where the balls run is the underlying steel. The balls have worn through both the chrome and the copper and are now bearing directly on the steel.
Doesn't look that way to me. The balls should be running on the bottom, right-hand area that says "chrome". That area looks fine.