I've been grinding them for things like making them thin to fit old cap irons, or shepherd in this case (my shepherd cap iron has a very thin slot), or grinding them thin and then cutting out the center to make a screw driver to split nut saws. Which I've had to do twice, not because the first one broke, but because i lost it.
I just use a bench grinder, and if needed, a hack saw. at $1, you don't have much to lose when experimenting.