You don't know how to use it then... they don't move once locked down... I have seen many guys at the range trying to tighten down the ring, but that is the opposite of what you do... find the position you want the eyepiece in, then position the ring against the ocular bell, then back the bell out a half turn, then put one more quarter turn on the lock ring, then holding the ocular bell in your strong hand turn it back into the ring... you use the bell to tighten, not the ring... your grip on the bell is much more positive and you have a far greater ability to torque it down tight than the with the thin locking ring.
I once watched a guy put a flathead screwdriver into the lock ring knurling and tap it with a crescent wrench (obviously making a mess of the finish)... I asked him what he was doing, and he said he was willing to damage the scope to keep it from moving... I picked up my rifle and showed him how to back the bell into the nut... his embarrassed comment was; "well... sh!t."