I'm trying to loosen the handlebar mounts to move them to the forward mounting holes. The problem I'm having is that the nuts are on there so tight I'm afraid of stripping them. I'm guessing the previous owner put everything he had into tightening these things when he adjusted them. Are there any tricks to knock these things loose? I've tried a rubber mallet on the end of my wrench with semi-soft hits but was afraid to give it anymore of a swing.