I found the belts I need for my TEAC W-750R at https://westcoastbelts.com/product/new-4-belt-replacement-set-for-teac-cassette-player-models-w-760r-w-750r/

Simple fix for $23.00.

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For full context, visit https://www.electrondepot.com/repair/teac-cassette-deck-w-750r-184547-.htm

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