I was thinking about this as well. Worst case if it tears out is I have to change them anyway. I would grind the cutting end like an endmill so it would cut on half the hole.
$50 isn't a lot of money, but this wasn't my fault so I don't see why I should eat it. Should find out this afternoon. If they won't own up they will lose future business and I'll be telling anyone that will listen at shows and swap meets who not to use.
