Good luck sharpening the blades on these things once the kerf is ground
out. Called "not happenin' ".

These blades are abut 1/8 thick, and there are no kerf/set tools to my
knowledget that will set them. I have several kerf tools, and they are
perfect for my old Disston crosscut saws, but were never intended for
use on something that thick.

You can still buy those blades as they are still used in the saws that
some older picture frame shops have.

You can file all you want on that machine sharpened blade that you
have, but in the end it is still toast.

Time to make lathe parting tools, scribes, mini scrapers,etc. out of
the old carbon steel metal.

Robert