Believe me, the 'comeback' is the most hated thing in this business. It will chew into your shop's bottom line and personal income like you wouldn't believe. I can't count the number of times that people have come in for a repair, had it done, come back in for the same condition (quite often it's not really the same thing but they view it as such) and insist that we fix it for free since we 'missed it the first time'. The ones that crack me up are where we do a minimal repair because the customer says that's all they can afford, note it as such on the customer's repair order copy then they come back in demanding we fix it again for free even though they were told it wouldn't work or it wouldn't hold. You learn REAL quick that you do NOT do a 'patch job'; instead you tell 'em to take it somewhere else.
I went to have a tooth fixed a few years back, the doc X rayed the crap out of it, removed the top of the tooth, filled it with whatever that goop is, took an impression and arranged for a crown. It was about a 4-5 day wait for the crown, when I came back in for the crown to be installed it was discovered that the tooth had a crack. He admitted he must have made a mistake and missed the crack the first time around but also asked me if I had been eating rocks. He then made a big show out of refunding the $550.00 he charged me. Real nice, right?
Then I got the insurance statement: he had charged my dental insurance company $400.00 which he did NOT refund. Plus I had to go to a specialist to have the roots extracted which cost me and my insurance company another $600.00.
Wait, it gets better: I was then told that to fix it I needed a dental implant, one of those titanium doohickies that affixes a fake tooth to the jaw. I won't go into detail, suffice it to say it would take about 6 - 12 months and around $8-10k to install. It would be prone to getting food particles under it and there was a real possibility (something like a 10% chance) the titanium anchor could break at a later date, leading to big time jaw surgery.
Screw that. It's not a visible tooth, so I have a gap there. So my fang doctor's 'oops' could concieveably cost me $10k or more.
If we did that, all the TV news channels would be out here with their 'crimebuster expose' cameras making a huge deal out of it.
'Nuff said on this topic. I gotta watch that Adam Savage vid when I get home, I want to see if he's a nuts as he seems to be.