I don't know the reason but today on almost every figure that has
raising eyebrows we see the windshield wiper type effect. I don't
know about you but to me this is just the wrong way for an eyebrow
to look. Eyebrows do not move from the far corner of the forehead
and move upwards in a 45 degree movement. That is just wrong and for
some reason that is what we see.
Frank Marshall the genius that he was corrected this by the use of a
tiny cut out wedge on the side of the forehead in which the little
piece of metal rod would ride giving the 45 degree pitch. The the
eyebrow on the forehead moved in a more natural correct style. The
small piece of metal was painted to match the skin tone then the
metal shaped eyebrow was soldered on and painted.
Frank also realized that he could get the same effect without the v
wedge cut and just the piece of metal coming out of the side of the
head and then bent to the right position to give the correct throw.
I have pictured this as well.
I have also included just painted eyebrows done by Marshall to show
you that he shaped his raising eyebrows just about the same.
From a very slight distance you only see the eyebrows moving up and
down and you do not see the metal ends. Also you do not have the
incorrect windshield wiper type movement.