Underwood Standard Portable 4 Platen Knob

A faithfully-recreated platen knob for the Underwood Standard Portable 4-Bank!

This can be used either as the left platen knob for later-production Standard Portable 4 typewriters, or as the right (and only) platen knob for early production units.

I would recommend using a heat-set screw insert in the screwhole, as otherwise the plastic won't grip the screw very well, resulting in the knob sliding around.