How to fix doubleclicks?

How to repair a double clicking mouse?
I have this mouse, and on the top panel there are two black squares on the inside where the mouse cover connects to the clicky part of the buttons I suppose, these two black squares have become worn over the years, I believe this is causing the mouse to rapid fire click when I hold the buttons down. I tried fixing it with a piece of tape, but the tolerances are very fine. I looked on logitechs website for a replacement top panel, but I didn't see any. The mouse works great otherwise, and would be a shame to throw away.