old machine but works great no idea how old it is but have no idea how to thread the bobbin ghere does not seem to be a choise of knobs etc. I have sewed for 50 years and know this stuff but totally stumped here. It is the old metal bobbin the machine is orange trim. I can take a picture of it if it would help. there is a zig zag choice and a darn normal and heavy choice but no bobbin and no reverce??? Help please if you know//// It belonged to my Mom and want to pass it on to my grandaughter but need this info first...thanks pals Janisl