I have a HP mouse with the 'scroller wheel' in the middle of the right and left click buttons. Anyway, last night I was just scrolling along when my wheel quit on me. I can still right and left click, but the wheel won't let me scroll. Can you fix these yourself. I just wanted to try to get a few more scrolls until I can get to the store. I took the screw out of the bottom while ago and looked at it inside. Couldn't see what I thought may be the problem. Any suggestions?