Unable to locate a product manual for, my mothers old Portable Riccar Sewing Machine. I'm not even sure, how old this machine is. Being a "green horn" with sewing, I don't honestly know how to thread it, for correct operation. I only threaded the neddle for my mother, when I was young. So if anyone would be willing to help me, I would be very greatful. I would love to be able to learn to sew.