DERG
I take it you are familiar with the technology surrounding turned tubes, or drilled, as it may.
In the rather sharp pics of the tube's end are two types of odd artifact. The Fractures are straightforward. What puzzles is the brownish off center coving at the lip's edge? It seems to be part of a patent "wear" signature, quite different than the irregular faces of the fractures. It has swirl marks as well. The area at the offset "drill" blunder also seems to have been "worn in" similar to the lip damage. Any thoughts?
I still am not clear on the need for such complex machining if this is but the terminus of a supply line. Everything I see suggests this is one end of a "coupling". If so, the wear evident in the image suggests a poor fit with the mate. Disclaimer: Now that we are all hyperfocused on this oil tube, what of some of the other telltales?
bear