capo-hardening?

[Mark Cramer]

In discussions about string-termination noise, I've heard mention of (re-
hardening duplex surfaces, but have no idea how this is done.

1.) cold hardening with a burnisher, or gentle peening with a hammer?

2.) heating with a torch, arc-welder?

3.) a combination of the above?

To those who have had success, I welcome your advice.

thanks,
Mark Cramer,
Brandon University