scroll chuck jaws - anyone made 'em?

[Rickabilly]

On the idea of softening a set of jaws from another chuck and then re-hardening after reworking the shape, well... the softening is easy, simply carefully seal them inside a steel box purged of air and replaced with some inert gas then heat soak the whole deal above the critical temperature for about an hour per inch of section, then bury in dry sand until cool probably a day or so later, the jaws will be soft and the lack of oxygen will protect them from scale formation, re-hardening will require more accurate knowledge of the metal used in manufacture but a good guess might get you by on this, once again seal in a box for hardening this time maybe pack in charcoal like when colour case hardening ( but probably use powdered wood charcoal for better protection, there was a method that used a simple wheat flour dough which turned to carbon in the furnace) then drop the entire contents into the quenching liquid the quicker the better as this will not allow time for scale to form,

Regards
Rick