I am not clear with the root cause. Does the counter bore feature required in WP machining process drawing? If yes, why such information is not shown in the past?Remarks: This part is not 100% affected since day 1. So why some part is OK but some is not OK?Why such requirement is not incorporated into the CNC machining program so that the counter bore is always present at the correct location? Please use 5 Why to identify the real root cause.