Because I have done this repair more times than I can remember some things become so automatic that I never think of as important and I have left very simple but important steps out.
To make things a lot easier you should open the crack without making things worse, this is done in two stages, firstly at the full extent of the cracks travel bind the stock in inertube strips to prevent further travel while you are working on the stock. Secondly on the open end of the crack tap in a hobby knife blade to open the crack failing one blade you can add others to improve things, please remember you are not making the Grand Canyon . Though in a lot of cases the need for a stop binding not necessary, Though one thing I have always done after a split repair if I can is at the end of the crack I drill a 1mm hole to put a stop the cracks progress.
I do hope that some of you folks have noted down some of Damascus's tips, because my time on this forum is now on a countdown.