Adjustable aircraft cable suspension for lighting fixture

[BT05]

I need to hang a light fixture from the ceiling but I want it to be adjustable.

I want to make something like this:
http://www.litecontrol.com/stuff/con...able_sheet.pdf

But really anything would suffice, as long as it's adjustable. Any ideas? Also what is recommended for attaching the cable to? I only know of screws with eyelets, but I need something more secure...