HyperScorpion display: screws and then some

Great ones!
One of the screws holding the display on my HyperScorpion fell out. Two questions:
1. Trying to tight the remaining one, but can't figure the right hexa screwdriver I need. Whatever size I try, it does not seem to sync up nicely. Could be my lousy mechanic skills... but nevertheless, in your experience: what is the size?
2. Need a replacement screw. Where can you get that (online)? And what am I looking for (direct link much appreciated :)

Thanks,
D-J in Los Angeles
 
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