Yes, so far there is nothing about this that raises a red flag for me. As it stands now, I don't have enough information to second guess the judgement of the mechanic in the field. It's possibly that he's going too far, and it's equally possible that it's perfectly safe. the devil here is in the details.So nothing about this situation raises any red flags for you? Would you have risked your bottom line and reputation on the safety of that deal?
It's always easy to say something may be unsafe. After all there's no way to determine the consequences of an accident that might have happened. Following that logic to it's conclusion nothing is safe, so we need to make judgement calls. And those need to be based on real information about the particulars.