you could test and see if thats the problem buy cutting some cardboard out of a pizza or cerial box and use it as a shim under the clamp. Thus making the clamp tighter and test it. If that fixes the problem cut some pieces of beer can or then go insearch of a clamp. Make sure the squirrel condoms are in place and have no signs of cracking.

I learned all I need to know about life by killing smart people and eating their brains.
Eat right ,Exercise ,Stay fit, Die Anyway!