There is something that puzzles me!
I am not a great MOCer myself, although I mod quite a bit. But I have built a few "iconic" MOCs like Sheepos Landrover, Jürgen Krooshops ultimate 8043, dfs473 wonderful Sennebogen tracked crane etc. Right now I am building the Grove K460, so I can say that I have seen quite a few instructions.
But nobody, I repeat: NOBODY has ever used this part: http://www.bricklink.com/catalogItem.asp?P=15100!
I find this part extremely versatile and useful and it´s neither rare nor extremely expensive,so it`s quite astonishing nobody uses it.
Enlighten me!