Wiley Horne
Hi John,

You’re certainly right about glass thickness. The reason I recommended 1/4” is because I don’t think Jeremy will be doing scary sharp for long—he will eventually be hollow grinding and following that with two stones. And the sandpaper can be relegated to metal removal and back-flattening which are important in their own right. For true sharpening, sandpaper has thickness and as the blade begins getting sharp, it’s typical for the paper to furl and dub the edge. I think Bill T’s method in the Articles involved pulling the iron to minimize this effect.

So. 1/4” glass can be readily found and placed on a reasonably flat substrate, for cheap. And will have some utility going forward for heavy metal removal (music reference intended).

Wiley