It was me....Here is a link showing the canvasses in a frame:
Framing Photos
Look under framing, it is the Cuban Pictures...
Now the idea was given by someone here on the grumble so it isn't original to me, and it is similar to a technique used by upholsterers;
I cut mat flawboard strips to about the same width as the stretchers. Using ribbon that was (as I recall) 1 1/2" wide I stapled through the flawboard, through the ribbon and into the stretcher material. I left about 1/4" free at the starting point (no mat board).
After I had stapled this around the edge of the frame I folded the ribbon over the matboard, and stretched and stapled to the back of the frame. At the end/beginin of the ribbon I folded the end over and in so there was no cut edges showing. No staples show on the sides, only on the back of the stretcher bars. This technique worked well to hide the staples that were originally used on the sides to stretch the canvasses.
If you look at the picture showing edge application detail this may help clarify.
I have an upholstry air stapler that shoots a 23 guage staple (I think I use 3/8" mostly). Senco makes one, mine is an asian knock off and works just fine. I actually use those staples for most of my fitting too! A fairly versitile gun.
Feel free to ask if this is not clear
James