If you do get the screw out you can re-tighten the inserts into the bodywork by putting a long screw through it and winding a nut down the screw onto the insert to squeeze it tight again, whilst gripping the screw to stop it from turning.
Worth putting copperslip/ grease/ even loctite onto the screw when refitting.
Mine were a real pain.
Tried just about every tool I own to grip the edge of the insert enough to slacken off the screw.
Loads of WD40 and wait a number of weeks for it to slowly penetrate did it in the end.
Heard of people drilling a hole adjacent to the insert to grip it from the back and put a grommet in the hole afterwards.
-a
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