Here’s a photo of one end of the Cord - very low-tech using some tarp grips I had spare. There’s a notch in them which I use to align with the piping for accuracy.🙂
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Iirc, The tube blocks are Milenco ones, which lock into the steady feet, so upside down they get a good grip. I’m going to try a rubberised coating on the flat side to make it less slippery, although the tube uses velcro at the ends, so I might try that.