I am having a problem with an FSA SLK carbon crank. After tightening down the left crank arm, the bottom bracket siezes up. It is as if it were being pinched. I can get the crank to spin freely (at least as freely as it will spin) when the left arm is a really loose, but then I have play in my left arm. Anybody run into this problem before? Any suggestions or ideas on how to fix it?