Since B481745 is a model 27, you can find the manual here: http://www.singerco.com/support/instruction-manuals . Enter 27 in the search box and then scroll through the list to the Vibrating Shuttle model. The direct link to the manual is http://www.singerco.com/uploads/download/268_27_28.pdf . Some parts diagrams are here: http://parts.singerco.com/ . Look for the replacement parts for Industrial machines then look for the model 27_1_2_3_4 (different variations of the model 27). A list of parts (with pictures of the part) and the pricing is here: http://parts.singerco.com/IPpartCharts/27-1_2_3_4.pdf .
Go google and type in---workshop manual for singer sewing machine model 27-- the beauty of singer is that there were few changes made in the treadle series so any book around that age would be helpful
Answers & Comments
Since B481745 is a model 27, you can find the manual here: http://www.singerco.com/support/instruction-manuals . Enter 27 in the search box and then scroll through the list to the Vibrating Shuttle model. The direct link to the manual is http://www.singerco.com/uploads/download/268_27_28.pdf . Some parts diagrams are here: http://parts.singerco.com/ . Look for the replacement parts for Industrial machines then look for the model 27_1_2_3_4 (different variations of the model 27). A list of parts (with pictures of the part) and the pricing is here: http://parts.singerco.com/IPpartCharts/27-1_2_3_4.pdf .
I hope this helps.
Cindy Wells
Go google and type in---workshop manual for singer sewing machine model 27--
the beauty of singer is that there were few changes made in the treadle series so any book around that age would be helpful