One other thing I learned from Techmoan is that one of the few remaining companies making cassette playback mechanisms today is a company called "Tanashin" - and I only bring that up because that name is on a sticker in one of the photos inside this 2-XL in jgrahamc's post.
It looks like Tanashin is out of business now. At least their website returns a 401 and has for the past year or so (according to the internet archive).
Another youtuber, VWestlife, has more technical and has talked more about this. As another poster notes most of these are knockoffs and even the motors are knockoffs that go so far as to put the label of a more reputable company on them.
