The tube you described shall be on the left side of the picture in this post:
In this post, you can see it even better:
It looks as if it is held in place by a small circlip.
Here it can be seen even better:
The tube is called spacer and is held in place by a thing named E-type ring.
I belive, this is one of the circlips on the left side of the picture in this post:
P.S.: I found this, using the new gallery function: Gallery - Schlumpf hubs: general discussion
@Canapin : this function is a real win!
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