A machinists shop should be able to recreate the gear for you, or have a suitable one lying around. You'd be surprised how many things have the same gear pieces.
I've never seen one of those in person so I can't help you with the details of getting it going. Maybe one of the others has hands on experience or a link to a manual.
I've never seen one of those in person so I can't help you with the details of getting it going. Maybe one of the others has hands on experience or a link to a manual.