need help fixing

Hi, I just got a boombox I’ve been tinkering with working, but I got one last problem. The belt inside is too loose. Common problem, but the issue is that I can’t change it. It’s as deep into the thing as it can possibly be. I will never be able to change it without cutting cable to take it...

Greetings-I had hoped to introduce myself in a diff.way.So here's my dilemma.I've got all of the cabinet screws out and knobs off of my new panny 5025.She won't come apart.It's like sticking down at the bottom of the cab.right around the cassette keys,seems kinda like there is still a screw in...