When I got mine out ( no pun intended )...... of the box I immediately saw how huge the thread was, then began having a fit, and generally crying to myself. I then looked in the box again as I knew they had sent a free sticker so at least not all was lost.
I then spotted the locking nut and thread adapter in a tiny bag in the box still. At this point I was having a strop in front of my parents, saying how I had looked up the correct thread size and that, and I quote... 'Stupid Yanks sent me the wrong f*ckin one!' I Immediately paused as I pulled out the bag, silence fell, and I skipped off happily.