handle of this drill is about the same size and shape as that of the
other No.4 drills, but it's attached differently.
attachment of the crank handle consists of a straight shaft pressed
into the gear casting and then peened over a small, contoured, brass
washer outboard of the handle. Later, the attachment was changed
to a headed pin that was peened on the inside face of an extended crank.
also in the composite image above that the toothed side of the main
gear has lost about half of the tooth that was intersected by the shaft
of the crank handle. This error in design led to introduction of the
headed crank pin.