If you look at them you'll see that the housing comes down over part of the connector so you can't get to the nut part of the connector in case you over tighten the cable. That what happen to me as I put on a small section so I can hook up my FS1 and when done us a barrel connector. When I was hooking up my meter I didn't realize that the cable was also turning and it may have tighten itself or when they build the LNB they didn't really tighten it before attaching the the board as it took very little to destroy it and I only finger tighten.
I purchase from Ebay (330551320886) for 8.99 and free shipping for the Xtreme II.
Same thing happened to me with the Avenger, it was not tight , not stacked or locktited.
spun out and tore itself from the board, in the trash it went.