I also attempted to take the mouse apart since I couldn't find my receipt from when I purchased it around 1 year ago.
Needless to say I had the same problem where the plastic broke off in the gear. I have another friend who uses the same mouse and says he has a very similar issue. After looking through some forums and other posts, it seems to be a very common issue with the yellow edition of the Scimitar but does not occur with the black edition (I am not familiar with the differences between the 2). In all honesty this issue could easily be avoided if they made the MMB click and scroll metal instead of plastic because others said they had an issue with it pressing down as well.
Back to my attempt to fix the issue. So far I manage to get the broken piece out from the gear and have glued it back onto the mouse wheel. Currently I am going to wait a little while before attempting to insert the piece again because I fear it will just brake off since there is no easy way to reinsert the mouse wheel back in the gear. If not, I may simply slice off the end and the reattach it after it's already in the gear wheel.
