As I see it you have to replace the screws to a type that can be tightened using a wrench instead of a screwdriver. I had the same problem when fitting the radiator brackets, but then I inserted the screw from the other side and tightened the nut on the outside (using a small adjustable wrench).
You might perhaps use a small screwdriver "bit" held with a pair of pliers or a wrench and try to tighten the screw, but it would be a bit tricky...
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