I changed hi hat stands last night and did nothing to the hats. The lower hat is now wobbling on its collar which extends through the cymbal. There is a large nut on the bottom of the collar. Is there a way to tighten it or will that break the cymbal? I have the rubber pieces that secure the collar to the high hat stand and it is tight but that is not where the wobble is happening. When I strike the top hat the bottom hat wobbles and hits the top hat.