These are the original style with nylon pins. For awhile we had an improved version of the gear that replaced the pins (which are probably what are broken on yours right now) with springs. These improved gears are no longer available.

One of these gears will solve your problems, but you may want to consider replacing the whole motor with one of the aftermarket ones. The replacement gears should last another 40 years, but are a poor design. The new motor hopefully will last longer.