Installed a used USO scope on my LaRue OBR the other day and tried to sight in, but had a lot of trouble. Wasn't sure if it was the scope so I tried re-centering the reticle. Got the elevation set but when I tried to run the windage full left to count turns it jammed and I cannot move the knob no matter how hard I turn. I don't want to put a wrench or anything on it but was looking for suggestions to free it up.