I got my ATX about a month ago and am very pleased with it. I have a question about the extension rods. First, none of the extensions are "round". Is there a reason for this, or is this just how the machine is made? Second, the lowest locking unit, for the lowest extension, doesn't seem to move as freely as the first and second locking unit. After using the ATX at the beach, I have to put in a lot more effort getting the lowest locking unit to loosen up. Does anybody else have this problem with the lowest lock? Is there anything that can be put on the rod extensions that may help them glide more easily?