Ha... no explanation needed. We have a First Amendment for a reason so exercise it often—especially when working on these engines.
On a side note, I'm surprised that the seal height isn't greater (say, 0.5mm, for example) and uses the angle in the collar as a mechanical wedge. There must be a reason why the injector masts have an angle rather than a shelf. I guess I need to see one of these in person to get a better insight on the design.