Hey KYBOY - thanks for the heads up on the different qualities between individual rasps - I just started using them myself lately. Both my wife and I are farriers, and the stockpiles of old ones were growing ever larger. Right now, I'm experimenting with simply forge welding them in half lengthwise back into billets of steel, upsetting one end, and making various sorts of tongs from them. From experience, I know that they can be fairly brittle (watching a horse stand on a new one left carelessly on the floor! ) and have thought perhaps that a bit of annealing might help avoid any disastrous cracking due to an accidental hammer blow to the head of the tongs while in use.
