Dean you may be correct but I once sent a GH 20 gauge to DelGrego for some work. They refinished the wood but told me they would only do Cyanide hardening.
When pressed for why I was told by Larry that there was to big of a chance to have the frame warp or crack. No offer to send out.
Possibly they do send out for bone and charcoal hardening but I was not offered this option.
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