Cannot fill new bobbin on my T&S 648
I have the Singer T&S 648. It was humming along beautifully until it ran out of bobbin thread. When I tried to fill the bobbin, the needle is hitting a "metal ring" below where the bobbin sits. I don't know the proper name for this part of the machine. Hence, it will not fill, since this bobbin fills in the machine. Does anyone have a clue as to what might be wrong with it? I do not want to put a ton of money into this machine. It sewed a beautiful straight stitch up to this point when I was piecing my blocks. Thanks for any help or ideas.