Fixing the Sony WM-F15 incl. belt change - a sticky situation!

Hi all, I'm a big fan of the smaller Sony Walkman models, but they are quite difficult to try and fix. From 1984 (36 years ago!) this WM-F15 really packs a lot in to a small form-factor and looks great, but I encounter a rubber belt which has turned to Goo, amongst other things! Can I put them right?

Music by monkeysyndicate:

https://www.youtube.com/watch?v=MAKrVUju_ck
https://www.youtube.com/watch?v=v2nZSI7nR6w

Видео Fixing the Sony WM-F15 incl. belt change - a sticky situation! канала SyndicAlex