First and foremost - welcome to the quilt board - I see this is your first post, hope it won't be your last! If you could post pictures of the machines, I am sure someone here can help you. You mention one with a dial. Is it a sliver dial on the bed of the machine, next to the bobbin winder tension? If so, it may be a 101 - but again cannot tell without a picture or the serial #. Post the serial #'s if you can't post a pic.