Razer's own demonstration shows EXACTLY how the double click happens in this video.
How the metal contact point is the real reason.
The Razer Optical Mouse Switch - YouTube
Skip to 0:18 should you please.
So, us gamers who've been around many different mouse models spanning from logitech, to cougar, to zowie to razer have faced one problem. The dreaded double clicks.
We know that the Chinese Omron with the prefix D2FC are the biggest culprit for which Zowie switched form them to move to Huano...