Not sure if others have worked with the New Jersey Factory Service, but they’ve been servicing my Tascam DAT and cassette units for years. They may have the parts you seek.
From: Scott Todd [mailto:email@example.com]
Sent: Thursday, July 13, 2017 11:25 PM
Subject: RE: [CRTech] Tascam 202 MKIII Question
I think there are still a few sources for belts, just don’t recall off the top of my head what they are. I think I have one or two of these myself and wouldn’t mind getting at least one of them going again.