I found this thread: http://forums.macrumors.com/showthread.php?t=602718 I adjusted the screw to various looser positions. However the problem I had is that once I replaced the battery, the force required to do this (pushing it down so you can lock it in) pushes the screw back down to where it was. In fact after loosening the screw quite a bit and replacing the battery it was even harder to click than before (it's practically unusable now). Is there something I'm missing? I just switched to multi-touch gestures for now when I don't have an external mouse handy.