I got a few different opinions on my recent bad exhaust experience, but I'd still like opinions on this specifically:

I know that removing it can be difficult. But is it a sign of a bad mechanic if he "slips" with the drill bit and knocks off a piece of the exhaust head of the engine, puts black silicone around it, and re-drills the head at an angle in a different spot, and holds it on with a bunch of washers? Should I be paying for the fact that he couldn't drill it out well?

Ed