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I've been building a cable cam the past few days and this is the finished product. It's runs completely smooth with no shake or wobble in it. It has full tilt and pan. My next step is to rig up some sort of remote controlled motor or brake to it to control the speed.
The run I had setup was pretty short, mainly because it was set up pretty steep. The cable is 50ft long
Hi res and streaming version
http://files.filefront.com/CableCammov/;8893833;/fileinfo.html