DIY/Cheap retractable pendant hanger?

[kwirky]

I'm getting a PFO pendant light, probably, and I'm wondering who out there made their own retractable hangers, or found one for a great price not meant for the aquarium hobby? I would like the ability to quickly raise and lower my lights, as I've heard it's a great feature of pendant lights, from tank maintenance, to raising it to prevent bleaching new corals.

Any ideas?