When doing small production runs (200 pcs) engraving on parts for customers. How do you handle scrap/errors. Do you tell the customer that for 200 pcs that a percentage may be scrap? I have engraved a fair number of parts for this customer but occasionally I make a error on a part. The part costs me about 8 times my piece charge to have the anodize stripped off and re-anodized to fix my error. What is the best practice to handle this?