Some people have had problems screwing the lag bolts into the rails. It worked great for me. when I bought the rails I sampled different sizes with different lag screws to find the right fit. I used 3/8 lag screws with 1/2" outside diameter pipe and an inside diameter of 11/32. this was the available at my nearest home depot. this may not be the same you folks. also I tested a 3/8 lag screw and a 3/8 inside diameter pipe which was too loose, so i put some JB WELD inside the pipe, let dry halfway and screwed the lag bolts in for a nice snug fit. but once it drys you'll never get the screw back out. but it does work.
also the cheap tripod head was screwed from the baseplate into the plastic to hold it on. its a little crude but works great
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