This morning, with modified razor blades ala Rai, Rich and I tested how we would remove a ~2mm strip of gold/chrome coating from a CP.  We used the old, now spare, CP09 and scratched off some gold at the tip of one of the solder fingers on the barrel of the mass.  The solder finger can be reused if needed further down the finger.

It was somewhat easy to scrape away the top gold coat, but the chrome underneath took some convincing as expected.  We tried a few different methods and tools but in the end, it still looks like scratching removed all of the conductive material.  To test that we were efficient at this, Rich then HIPOT tested at 1kV to make sure there would be no arcing when used in vacuum at the designed high voltage.

There was little particulate seen during this scratching - most particulate seemed to come off with periodic wet wiping.

The glass is scratched but the ~2mm thick scratch site does not appear to be very deep into the substrate (as viewed from the inner surface of the barrel).

The process took ~30 mins of slow start and stop scratching/shaving.