Just saw this, Zulch, so a little late in response. Yes, I have this book and would not be without it!! Using the illustrations I was able to match up the correct bolt for a friends 1st Gen. Colt SAA. Then the directions walk you through the correct fitting procedure. I could have fitted the bolt, but it is nice to know exactly how it is/was done at the Colt factory. When I have a job or project(Colt SAA type internals), the first thing I do is reference this book. I periodically peruse the book just for enjoyment as much of the information is applicable to the Colt type Open Tops and other Single Action sixguns from the same time period. Hope you get much use from this book!