So, does anyone know how to change the drive belt in a Famicom Disc system?

Hmmmmmmm??? spock

yup, not too difficult, just a little scary the first time

This is one way to do it,

<a href="http://homepage1.nifty.com/tikuwamushi/disksys.htm" target="_blank">http://homepage1.nifty.com/tikuwamushi/disksys.htm</a>

you can get an idea of what's involved here.