RIM BlackBerry 8800 Smartphone

My trackball on my 8100 pearl stopped scrolling up. I tried pulling it out and cleaning it, to no avail. I was a little suspicious whether this would fix the problem, but it did. It looks and fits just like OEM. It was pretty easy to install: just pry under the silver ring around the trackball, and the ring pops out. Then pry the smaller silver ring out, and then pop the trackball assembly out and pop the new one in. Not for those that are very technologically faint of heart -- but no harder than, say, adding memory to a computer. Google "blackberry trackball" and people have picture tutorials. I am just glad I did not have to get a whole new blackberry to fix the problem.