http://www.lizzielenard-vintagesewing.blogspot.co.uk/2013/06/snapping-thread-on-singer-15k.html http://www.lizzielenard-sewingdesigns.co.uk http://www.lizzielenard-vintagesewing.blogspot.co.uk This is a 1945 Singer 15K treadle. The bobbin has to be loade