but essential and I searched everywhere on the net, I think this is the best price currently. It was the last piece of the puzzle needed to assemble all the elements (follow, casing, tripod, screen). I thought I could save on that by collecting aluminum rods on old strollers, they are 15mm diam. And well they are made not by 15.2mm and even disquant and sanding grain 30, it does not fit. So buy that, and it fits. Sometimes j'dis me, do not look.