Here’s a tip for those with scroll mice. Take the clicker out of the wheel. Scroll mice usually accomplish the clicking of the scroll wheel by means of a spring or metal stick that press inside the wheel. Take this out, the wheel will turn nice and smooth. It may take a little getting used to, but it will soon feel great.
Of course you should realize that the clicking serves a function: to limit the movement of the wheel. If the scroll wheel is too loose, it may spin out of control without it, but normally it won’t. In fact, in some mice, the clicker may cause unwanted scrolling, so removing the clicker will eliminated that.
(The little metal stick inside my mouse broke recently, and I panicked because it was a fairly new, expensive mouse, but before I knew it I was hooked—pun intended. I never want to use a clicker again.)