FULL DISCLOSURE: I copied and pasted this review from someone called CHARLES ROBERTS, online at amazon.com (after getting a copy of the book on loan from my local library network). I agree completely with the reviewer's comments.
URL as at June 1st, 2019: https://www.amazon.com/Complete-Handbook-Sewing-Machine-Repair/dp/0830611630

REVIEW TITLE STATEMENT: "Outstanding Vintage Sewing Machine Repair Book Emphasizing General Repair Principles With Four Chapters On Specific Brands"
REVIEW: "I repair vintage sewing machines and this is one of the best, and quite frankly few, books covering sewing machine repair. I don't understand the negative reviews. Some said their model wasn't covered? Well, a book that covers all models doesn't exist and never will. Some said they wanted more illustrations but I think it is very well illustrated. Some complained that the type is too small, well it's about what I find in most paper back books, fiction or non-fiction. Now there are a couple of exploded views which are indeed difficult to read but they are the exception. The author devotes the first three chapters to sewing machine mechanisms, general maintenance and generic repairs. The next four chapters cover various brands; Pfaff, White models with oscillating shuttles (common to most Japanese imported badged models) New Home machines and one Brother model. The important point is that the author chose certain popular models to illustrate different mechanisms, allowing you too use those principles to repair most vintage sewing machine models on your own. This is a very good book on vintage sewing machine repair."