Seems to me the shares are self sharpening. I’m not really disagreeing, just not sure what it is one would sharpen? Are you putting a bevel on the front side?Well, with that thinking, why sharpen anything. True they will need to be replaced sooner if you grind away some of the material but at least they will work better for this extreme condition he is faced with. The alternative is throw them away today.
What happens is they lose the proper angle?
As I mentioned else where, dad would heat the tip and beat it down a half inch or so, this would give it some suck again. Of course it messed up the hardness of the metal and the tip angle wore down much faster, but as you say it was already wore out, got a few more acres out of it. The Oliver he used was good at still having a tip to beat down; the jd plows we used the tip was the first thing to wear off and wouldn’t have been much there to bend down.