I was happy to find your site. My parents have a woman's Auto-Bike with some sort of sprocket problem. Do you have any ideas as to a possible source for replacement parts? Please email me if so. I appreciate your time.
Although that bike isn't usually sold by regular bicycle shop, a good bicycle shop should be able to diagnose and repair the problem with an Auto-Bike because it's mostly comprised of regular bicycle parts. So, that's where I'd recommend you start. In a worst case, the shop might discover that there's a proprietary part that's damaged and you might have to contact Auto-Bike to get a replacement, however, most times these things can be fine-tuned with basic adjustments that any good shop mechanic can handle.
Hope this helps,