For me this was a big breakthrough, a belt that works for the Betamovie auto focus drive. I have several of these and the common problem is the non functional auto focus, here is a working solution. And here are two links;<br />https://www.amazon.com/Dental-Orthodontic-Rubber-Elastic-Supply/dp/B01HR43MJW/ref=psdc_3760931_t1_B088QWWLG4<br />https://youtu.be/1e59tfYssCI
