I have always just used the Dremel and the cutoff disks to shape regular screwdriver blades to properly fit whatever screw slots I had need of fitting. I aint got $60 to waste on a specialized set of screwdriver bits. I made/make almost all the other tools needed for smithing, too. Ferchrissakes, man, who does enough barrel removals to justify tyinig up $300 in a barrel vise and action wrench? I made mine in 3 hours. $100 an hour, tax free, is pretty good pay, in my book! :-)