One scenario which comes to mind, is that, in heat treatment, they warped the frame beyond repair. This is conceivable if temps got away from him, or quench went south.
I don’t think Matt said what the configuration of his gun was, but there are plenty out there, and if I cared for my reputation, and I failed in that (potential) scenario, I think I’d pony up for a replacement gun, instead of compounding my sins with seemingly never ending BS

They sell guns under bachelderfirearms on gunbroker. They have 50 guns listed at the moment including a Parker VHE and DH in 20 gauge.

I know this question is being buried deep in a long thread, but how much does Doug Turnbull charge to case harden a Parker if it is sent to them assembled and returned the same way? I had one done a few years ago, but there were additional charges that I can't separate from the case color charges. By the way, I was very satisfied with the result.

Contact them and ask.

Their cch pricing is published on their site. But the labor to take down, prep and assemble will be additional and vary based on the gun.

The fact that Doug does not price the service in his price list is why I asked the question.

Ok. They used to have pricing for doubles and lever guns published. I think their retail price is around $400 now to do a doublegun and related parts. That is for a prepped and ready to go frame. Requesting a quote would be the best way to go still. However, in order for them to know how much surface prep may be needed, they may want to see photos before quoting, which may be an issue in your case.

:duck:

I just thought I could get one of our members to tell me what the full disassembly and reassembly added to the base cost of case color in their particular case. Many of us have had minty Repros redone with bone charcoal, with disassembly and reassembly included. What did that cost?

$550, although its been a few years, so I would assume more now.

Was the $550 for the disassembly, reassembly, and related extras or the whole job?

That was for everything, including touching up some engraving.