Replacing nails - placement  

Hi All,
I found this site so helpful in my first attempt at weaving (a Moeller bench), that I decided to take on the task of re-weaving 6 Wegner chairs with split rails.
Unfortunately, when I unwrapped them, I discovered the original nails had been replaced by tacks of some sort. On the front to back pieces, it's easy to see where the old nails went, so I think I can just pull the tacks and re-insert L nails.
However, on the side rails, they did not use tacks or nails, just a staple gun. There are nail holes on the inside rails (about 10 on each) and on the bottom edge of the rails. Do I insert nails on the inside and the bottom? That doesn't seem right to me, but I think I need 22 nails total and that's all I can figure out. I have the Caner's Handbook, but none of his photos show the nails on the side rails.
Any advice would be truly appreciated!
Thanks,
Kristin