4 KudoZ points awarded for this answer. Comment: "You may not have answered for points, but you're going to get them, because I think this is pretty likely. I like the way you guess, Ariane. You don't simply say "just guessing" in the maddening way some others do, but you provide references for your guesses so I can least know what led you to make such a guess and can understand where you're coming from. The kinds of answers you give could go in a KudoZ "coaching manual", if such a thing were ever created, although both Jill and SYates did quite well here also. But anyway, the references have convinced me that "endo attachment" is definitely plausible, although the other answerers helped me feel reasonably convinced of the validity of "attachment". So thanks to you all - I appreciate your assistance greatly."