Cathy and Tammi,
Well then it seems that I'll just have to hope that 193077 belt doesn't wear and slip. I don't think they've shrunk in actual size, Sew Classic mentions they are larger than the size listed. At any rate it is bigger enough than it should be to have no adjustment left so if it does wear out I'll just have to stick on another one.
caroloto,
What is the number of the belt you have? Does your machine have a spoked hand wheel?
The spoked hand wheels have a smaller pulley diameter than the solid hand wheels.
Sew-Classic does address this and Jenny can help you get the right belt.
Joe