So I purchased a Pro's Pro Challenger 1 as well as a WISE Tension head. This is a big upgrade from my Klippermate M140 and I am absolutely loving it! I followed the video by YULitle: http://www.youtube.com/watch?v=rshyofxT_TY on how to mount a racquet on a 6-point mount machine. When securing the top and bottom posts, I tighten it to the point where I can still move the racquet up and down but it is secure when trying to wiggle it sideways. As for the side-posts, I tighten it to the point where the posts is perpendicular to the racquet, not slanted at all. As I string the racquet crosses on the bottom half of the racquet, I notice that the racquet literally moves when I pull tension. This unsecures the posts of the side not withstanding the pressure. I am not sure if this is normal or what I should do to secure the posts tighter. Please help!