[Eliot Ness]

Unless the part that broke is not shown in the picture it looks like Pot Metal to me. If so you might be able to use J-B Weld (regular, NOT Kwik) to get it back together.

As far as belts this guy has what you need:

https://www.qualityradiobelts.com/order-here.html

I have used flat belt material that you super glue together that works pretty well, but I can remember if I got it from Mark Oppat or Alan Jespesperson.