I just ordered this new, open-box Citizen VCP-5MU on eBay last week for about $65 shipped. It was assembled by Japan CBM corporation (parent of Citizen Japan), with Hitachi 5" CRT screen, plus Akai VHS mechanism chassis. This Akai mechanism uses a unique nylon-tooth polystyrene loading belt, so it never needs replacing. It does use two flywheel capstan belts. Only two belts total. It plays only in SP mode.
http://studiosoundelectronics.com/mbk-19.htm
I would rate this Citizen 5" VCP monitor more-reliable than Hitachi's own version of it with the dreaded 6-belt mechanism chassis, so it's worth repairing the Akai mechanism with new belts and new tire. In addition, Consumer Reports would also rate Akai VCRs more-reliable than Hitachi too from 1992 survey, based on 1987 median-age models, if there ever was a rating for Akai.
Have you ever seen this Akai VCR mechanism before for service?