I've found with the Ansmann kit screws, use a 5/64 imperial driver instead of a 2mm metric as it's a better fit - they don't tend to round off then or if they have rounded from using the 2mm metric, switch to the imperial & that should get them out.
when building or repairing the car i always pick up the 5/64 instead of the 2mm driver & since doing so have had very little problems. Also when building a new car, always use a decent steel screw to pre-tap the screw holes in the plastic chassis parts etc by screwing it in a couple of turns & the kit screws fly in.
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