OK I would like a little help from the group, my friends mil just passed away and she gave me her sewing machine, it was her mother's at one point, and she gave it to her daughter years ago, it is a singer stylist, but I can not seem to be able to find any information on it. I need a knob for it as it seems like one is missing, it needs to be serviced and oiled. I do believe it is a drop down bobbin, any information would be greatly appreciated, it came in a cabinet, I am thinking around 1970? But not sure. Thank you in advance for your help.