Trying to remove the blower motor on my '99 Cavalier, I find (small) cap screws whose (hex) heads appear to be between between 5 and 6 mm. Across the flats, they measure about .217" (~ 5.5 mm). The nearest thing I find to that is 7/32", which seems like an odd size on such a new car. This is a solvable problem, but I find it puzzling. Can anyone shed any light on why this would be?
TIA, George