My Otari MX 50 had very badly worn tensioner guides as per the pictures. I approached Dewald from 77 Mfg and he came up with a modification that is both effective and elegant. This modification can also be applied to the Otari MX5050.
Very well done!
https://postimg.cc/gallery/tv9cilso/
Very well done!
https://postimg.cc/gallery/tv9cilso/