Forgive me if this article seems like I'm stating the obvious; but we really have had more than a few inquiries on our eccentric bottom bracket (EBB).
First, the EBB should slide in and out of the bottom bracket shell freely. It is recommended to put a small amount of grease on it; just so it doesn't get lodged in the shell after mud and debris accumulate and harden over a period of time.
Second, the EBB mounts into the shell by means of an allen bolt and 2 clamping pieces that slide horizontally. As the clamping pieces move towards the center, they will be elevated causing the EBB's diameter to effectively increase and lodge into the shell.
You can see in this picture the 2 clamping pieces are perfectly horizontal.
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As you screw the bolt in, you can see the pieces slide horizontally elevating along the grove increasing the diameter of the EBB.
So, that's really all there is to it, just tighten the bolt, and loosen it, with a 5mm allen wrench, and use a little grease before you get your frame so you don't have lodging problems later down the road.
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