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I've just built a barn door tracker and I used ebay to get the extra tripod head and remote shutter release. I found some old floor board and various nuts in my extensive collection of nuts and bolts that will come in useful one day. M6 threaded rod and hinge came from my local hardware shop. Mine is wound by hand at the moment and I really just threw it together to see if it would work. It seems to work so I'm going to start work on the next version with a better handle and some marking lines so I can more accurately turn the handle, right now I'm using the beeps from my remote shutter release and counting to 15 and moving the handle what I think is 90 degrees in that time.
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