My Favorite Tool Kit
iFixit has THE best tools for those finer, unknown threads. The Pro Tech Toolkit is the only set I need for IT work. There's no screw it can't unscrew, laptop it can't take apart and comes with more bits than you'll probably ever need. This is not a paid promotion or an advertisement, I just really love iFixit. They have alot of great step by step guides for disassembly too!
https://www.ifixit.com/Store/Tools/Pro-Tech-Toolkit/IF145-307-4