I have an alpha pioneer dc + and one of the clamps is so hard to clamp. I have to push really hard and it feels really grainy/sandy and feels like its gonna crush the string. The other one is very smooth and clamps easily. It is not that it is too tight because the string will slip if I loosen it a little. I was thinking about upgrading to some eagnas 3 tooth clamps if I cannot fix this problem. Any suggestions? I have also cleaned them a few times. Thanks to all that answer!!