Hello, I have designed a dovetail clamp. We machined it out of aluminum 6061 and tested it. While we were pleased with its clamping ability, the dovetail rail shown in the attached image developed these strange stress marks. The dimensions of the part have not changed. There are no visible marks on any other parts. Have any of you seen these type of stress marks before? What does this mean? Will there be pre-mature failure? How to strengthen this part? Regards, kaar.