Hello. Based on the recommendations of this thread, I recently purchased a Gamma X-ELS machine. I've strung several racquets already and did notice that the turntable brake when turned to the lock position still tends to move (mainly when doing crosses). I thought the lock was there to prevent it from moving but I've had instances where it appears to be locked but still moves (and makes an awful noise). I reviewed this in the manual but I don't see anywhere that indcates where I can tighten this so it does not continue to do this. http://220.127.116.11/collaterals/pdf/MXELS-1.pdf Any thoughts on what I need to adjust? Thanks!