Okay, I am completely new to stringing. So bare with me. I just got the MS200TT single-action fixed clamp in working order and was stringing the mains. Everything was great with this mahcine: easy to use; very accurate tension; wonderful clamps. About five to six strings from the center I noticed the base of the clamp moving under tension!!! The thing is suppose to lock the base to the turntable's glide bar upon closing of the clamp. I was afraid that my racquet might be damaged if I continued on. So I released the tension and searched stringforum.com It turns out that it's quite normal on single-action fixed clamp machine. It is suggested that tensioning the next string will regain the tension lost from the movement of the clamp base. Is there a modification I can do to completely stop this movement? Badminton racquet is very fragile. IMHO, repeated tension lost and tension gain is bad for the badminton racquet. In retrospective, everything is great except for the clamp base movement when it should be locked to the turntable's glide bar. I should have ordered the double-action clamping system!!!