Seems to me if you expected a specific item within a specific tolerance and received said item outside of that tolerance, you could then negotiate a lesser paym

Seems to me if you expected a specific item within a specific tolerance and received said item outside of that tolerance, you could then negotiate a lesser payment calculated by being a percentage equal to the difference in tolerance. So ultimately it would equal out by over engineering/over speccing the item to end up with a product within tolerance. Of course if they protest the price difference, well then... 'Cha Bu Duo', right?