SONY TC-K670 repair (belts replacements)

This time I'm replacing 3 belts on a Sony TCK-670 3 head cassette deck with dual capstan. I still didn't order proper belts, I just want to see if the deck will work with some Chinese random belts.
In this video, I'm showing you how to disassemble tape transport on many Sony cassette decks, clean the remains that old belts left (goo), and how to install new belts, there are 3 belts to be replaced / installed.