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Cassette Tape Player. How it works and how to repair. - YouTube
So here's the mechanism that started it all, the original Philips cassette recorder. This is a slightly later iteration with the speed regulator board but still the same chassis and layout. :
Cassette Tape Transport
Cassette Tape Mechanism EG530AD-2B 12V DC Motor 2400rpm CCW Deck/Player/ Recorder | eBay
Technics RS-B665 Direct Drive Cassette Deck Service - Audio Appraisal
Amazon.com: Walkman Cassette Player, Portable Tape Player Compact Recorder with Headphones, Audio Music Cassette to MP3 Digital Converter, Compatible with Laptop/PC/MAC/iPod - for Entertainment, Travel, Sports : Electronics