I took my boys and one of their friends on a tour. They replaced blades on two folders I had in the truck. One had a chip out of the blade(110) and a smaller one that didn't seem to hold an edge worth a crap and had been sharped to a isosceles triangle over the years. They even polished the bolsters. I still wish they'd go back to using 440C as the 420HC isn't impressive at all.
There are several online vendors and also the Buck Custom Shop that offer Buck knives with upgraded blade steels.
