Bob Terwilliger wrote:

> Yes, but you can't see them very well; the metal fittings at the
> corners of the shelves obscure them. But the collars are what's
> holding the shelf in place. Those things which look like vertical
> pipes fit together, and you can slide the plastic collars up or down
> on the pipes. The collars have a kind of lip at the bottom and a
> couple of "ribs" on the inside. The pipes have horizontal grooves
> into which the "ribs" fit. When you have the collars at the height
> where you want the shelf, you slide the entire shelf assembly down
> the pipes until the corners of the shelf engage the collars. The
> collars are tapered at the top, so that when the shelf assembly is
> slid onto a collar, the whole thing is wedged into place.

If you put the collars on upside down, not noticing that the word
TOP is etched on there, you will wind up with a very shaky rack.
Don't ask me how I know this. Heh.

nancy