Usually, you just have to loosen the 2 screws under the back hinges, and they come out and go back in pretty easy. Or, you can always take the whole cabinet in. If you were to take it to the shop where I work, we have a whole wall full of different size belts. We'd measure the belt that's on it, and maybe try a couple different ones. Set the belt tension. It's a pretty quick thing, so we'd probably only charge you for the belt. It shouldn't be too painful. :-) I think taking it to the shop is the best way to go. You've got the whole size selection that way, and you're sure to get the right belt.