can I ask where you got the belts from ? ive got an '80s Aiwa midi hifi and the twin tape deck is donalded. It started to run slow ,then played backwards and chewed my T'pau tape ! so, im thinking its a problem with the belts.
I got a bag of various sized ones off ebay similar to this set- www.ebay.co.uk/itm/124184180725?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=pnRJHrxkS3G&sssrc=2349624&ssuid=TYXzamVgThS&var=&widget_ver=artemis&media=COPY