the camera plate moves a little when the knob is tigtened. This is normal. The friction between the knob and rail cause this movement. Try adding one more plastic washer to the knob. Add some grease between the washes will further reduce the friction. This may solve your problem. Regarding your application, our NN Ultimate M1 will be a better choice. Multiple rails stops are possible (custom made) to remember all of 3 rail settings. Changing from one to another is a breeze and very precise.
Originally Posted by foto-biz