(1)Wouldn't these designs be all over?, and showing up on imagery? . (2) Why is the design so weathered like an archeological find, and not sharp and crisp, like if the tool was recently used?
I have reviewed NASA's design, and the teeth of the grinder are located on the peripheral (around the circumference) of the device, plus there is no (cross) structure in the grinder that would remotely give the impression of a celtic cross. What has been excavated by the RAT are a 1 3/4" by 1/4" smooth circles.
I am not saying that find up there is un-natural, or it is related to the device in this thread, but it sure is interesting, and a plausible explanation is still needed as far as I am concerned.