Hi Leon
Dont put a screw through that plate, it is the gearbox, looks like you have broken the plastic faceplate of the gearbox, the gearbox is a replaceable part.
Simply unscrew the other two screws in your photo, remove the cover plate and remove the two posts with a pair of pliers, dont lose the little plastic washers, replace the gearbox and re-asemble in the reverse order, easy.
Cheers
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