In your e-mail below, I cannot find any analysis of the root cause of the problem – what are the results from your internal investigation? Is this phenomenon, some kind of big pores or it is a non-metal inclusion (slag, oxides or else)? We didn’t observe such a defect in your product, ‘till now and we cannot accept it as normal. How it happened and why it is not detected in your factory? We still didn’t place official claim to your company, but as see it will come soon to you, so be kind and start your internal investigation. The affected surfaces are sealing, that is why we machine them, and that is why we found the problem. If you are looking for concession for this batch, please tell us directly, and we will see what we could do, but probably your request will be rejected.