I have the excellent 4 volume set of Brownell's Gunsmith Kinks, and consider it a wonderful resource for anyone who does their own firearms repair and refinishing.
https://www.brownells.com/gear/books-videos/books/gunsmith-kinks-4-volume-set/These are books you will refer to again and again. One of the best things is the index in each volume that also covers the contents of the earlier volumes. The assembly tip posted above is just one of many tricks and trade "secrets" that professionals use all the time to accomplish jobs that may be difficult or frustrating. Learning how to do just one of these jobs without doing further damage or losing a spring or other critical part can easily pay for the initial cost.
