scroll wheel on mouse is screwed..

[sp1nfer]

I've disassembled my Logitech mouse for a beating and after clean-up and putting it back together it appears that I've lost that "tick" or "scrub" which is felt and heard every time I scroll up/down. This is driving me nuts, instead of focusing on work, I'm being careful not to accidentally scroll up or down.

Was there a little something I lost or misplaced? I might open up another Logitech mouse and see what is used for holding the wheel but I'm afraid I might screw it too...

 

[Bbq]

It's a little metal bit that rubs against what looks like a wheel with ridges. It's probubly not lost, just bent out of place.