Here are a couple of photos I collected a couple of months ago when I was looking for an unrestored C-110. They must be very rare. I could not find closeups.
Apparently, some had a motor and small gearbox (behind the shiny bulge). I was told by a man that had a C-110, that the motor was similar to a Model T or Model A starter motor.
Thanks Joe, this is REALLY helpful. My dad has this pump and restoring it for a client, but parts are missing. We dont even have the sheet metal panels, so had no idea where they overlapped, etc. Our pump does have the motor.