Rustbucket Pioneer CT-W504R Auto NR cassette deck restoration

Restoring a rusty but trusty 1995 Pioneer cassette deck with a unique "Auto NR" feature that attempts to automatically detect which Dolby NR system (if any) a tape was recorded with. *VIDEO LINKS BELOW (CLICK SHOW MORE):*
Its successor, Pioneer's cassette decks with Digital NR: • A cassette deck that e...
Interface's video on cleaning, aligning, and demagnetizing cassette decks: • INTERFACE Tips Tricks ...
The test recording played with the correct Dolby NR systems: • Cassette tape comparis...