Here is
another user-made drill that has a commercially-made look to it. The spindle
has a proprietary bit-mounting mechanism somewhat like the Yankee push
drills, where the bits have a semi-cylindrical step. The main gear wheel
was made by casting from a roughly finished pattern. The breast plate is
a nice casting. The two handles have the same nice pattern and are well
made. From Rennninger's Adamstown, PA flea market about 1976.