Here is a link to print out a Singer 401a owner's manual
http://www.ismacs.net/singer_sewing_...ng-machine.pdf
I like to print them out and scribble on them you can make extra
401a repair manual - you have to scroll down 125 pages more or less to get to the 401
http://parts.singerco.com/IPsvcManuals/306W25.pdf