Another way to look at it is that books like the Blue Book, Flayderman's and others get 99.9999% right. That there are errors doesn't surprise me; I am surprised there are not more. Also, what would we do without those books and the other more detailed books on every kind, make and model of gun. The books on Colts alone would fill a couple of book cases and, while there are trash books there also many to which real experts have literally devoted a lifetime.
In view of the above, I will note that while much of what I write on those revolvers comes from my own knowledge and experience, more comes from several Colt books, especially Robert Best's A Study of Colt's New Army and Navy Pattern Double Action Revolvers 1889-1908.