Beltsturntable is like a so-called “sony repair center near me” the right online place for YOU to find and buy belts/walkman belt kit(s) from one of the best manufacturers from the first hands.
We did not even think that in 21 century we would meet the difficulties to buy spare parts or to find someone who can produce the rubber drive belts with the different sizes (section cut) for our sony walkman cassette players.
What is the issue to make a thin similar to the original square belt?
Hm. All sides should be smooth and even, without bulges, voids. Each of the angles is 90 degrees. The quality of the rubber or other material should be amazing. Everything should be done on perfect equipment by quality engineers. Plus a lot of time to spend on testing, testing, and testing.
So otherwise, if you install a non-quality belt in the player – there will be detonation, wear and as a result – the absence of positive emotions from listening to music.