I wish I'd asked for an adjustment after the fact on a recent shop I did. But it never occurred to me that this was "kosher," plus, knowing this MSC, they wouldn't have done it and probably would have taken offense. This is the same company that offered me a whopping $7 for gas/mileage allowance on a shop 60+ miles round trip for me, and which they were having trouble filling!
I learn something new every day, but not everyday!
I've learned to never trust spell-check or my phone's auto-fill feature.