Cool tip Bob
I had never seen it done that way. Simple and makes great sense.
Cobra29, a bunch of people sell a nice starter kits (jc whitney, nutt.com). You might give it a try. It comes with the tool and assorted sizes. Check out special #6, ThreadSert Kit
http://www.nutty.com/specials.html
If you are looking at the mcmaster catalog, I find that the nut-inserts are easier to use and more consistant than rivenuts (the later might be stronger though).
Item number 95585A100 is the tool hat comes in the variety packs and works fairly well.
Andy