maybe someone can help me. i have a 15-91 in a cabinet and i love the way it sews. me and my daughter want to take sewing lessons together. in order to do that, i need a portable machine. im looking for a featherweight. are there any differences in the set up/sewing in the 15-91 and a featherweight. AND does anyone know of a website that i can buy a featherweight off of? id like for it to be "refinished" and completely working and have a nice case with it. if there is a better light weight portable singer i could look for, id love to hear about that too!