Authorized reproduction of the Pfaff dealers repair / adjusting and servicing manual which according to the table of contents is for the Pfaff models 785, 786, 787 and 788 which are named the hobbylock. There are lots of detailed diagrams and it even lists by part number the tools and gauges that would make servicing it easier. This is scanned from an original and I am sure that you will find it quite useful. I do want you to know that it looks to me like someone has trimmed the edges of the pages. The tops, bottoms and sides end very close to the letters which are there. I have done the very best with it that I can.