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[Mixigodo]

If the problem with tightening them is that the screw heads are worn, this method is simple, but it worked for me with my FP3:

@opatut

A trick to loosen screws with damaged heads is to place rubber band across it, then push the screwdriver into it. The rubber helps it grip, and prevents further damage. However, this does usually require a bit of force, to push the screwdriver into the rubber and screw. I don’t know if that would exert too much force on the delicate electronics in this case, I’ve only used this in situations where that wouldn’t have been an issue. Be careful with this.

Afterwards, you may need some new screws. You can check this thread (or this one) to find out which ones to buy.