Hi, I've just bought some Neewer light stands which came with Bowens s-mounts for speedlights. However, the attachment point of the stand to the Bowens mount doesnt seem to fit properly. The light stand is much thinner than the aperture of the Bowens mount, with the result that there is a huge amount of play, even when the security screw is tightened. Is this normal? Is there some sort of width adapter that I should be using? Thanks in advance.