[audio cassette player] Are both or only one "axis" supposed to drive the tape?
(piefed.cdn.blahaj.zone)
It's been a long time since I used one of these. But back in the day I had multiple 'walkman' style cassette players (one Sony, one Pioneer, one JVC, and over it two others I think). And from what I recall, they almost all only drove from one of the two spindles.