I have some side stage Germans that are on a sliding track, I am wondering if there were any master carrier options that have an included brake in them. What I am looking for is a product like this Manfrotto option, but with something I can actually clip curtains into. I have looked at a couple of other options, but they all seem to be much longer and much taller. I would love something in the 6-8" length with limited height. In my perfect world, I would like to use these to prevent all the little kid dancers from pushing my curtains all over the place.