I'm making a cable cam to use to film more mountain bike stuff. Here is the test footage from the first version of it. There's loads of things need sorting out but I'm fairly happy with the first go.
The pulleys need some lube/grease on them to make the run a bit smoother.
The pivot that joins the loop to the top of the pulley needs a dab of super glue I think to keep it a bit more rigid.
I need to test it with the line being much longer and on a steeper incline.