I find myself needing a file guard lately, but they're all a bit expensive for me ($100-150), likely because carbide is a pricey material. I know we generally test whether a blade is hardened by seeing if a file skates; is there a particular alloy steel that I could heat treat for absolute maximum hardness and use as the face of a homemade file guard? Thanks for any advice you can give! P.S. I'm new to the forum, so apologies if there was a better place/way to ask this, or if the answer is easily found somewhere and I just missed it. Thanks again, guys.