I saw a thread on reef central a couple of days ago about the same thing. The guy wanted to be able to adjust the pendant for cleaning etc. He found Sunlift adjustable hangers at a hydroponic store (in the US) and they work on tension I believe. Wherever you position the pendant it stays - move it up it stays up, move it back down and it stays. They attach to the hook on the ceiling and then the wire would attach to them. I haven't been able to find these locally yet. If you do a search on yahoo under Sunlift adjustable hangers you can see what they look like.
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