Freehand, whith a flat stone (diamond, SC, ALO, Wet/dry), in the same motion you would do with a chisel grind knife, and the removing the wire bur in the other side, taking care not to thin the edge, since you only want to remove any damage the chisel could have. Carlos
I know, very old one. But i searched for "chisel" on the forum and from the first page this one seemed the more relevant. I put a chisel bevel on 2 saks. Working great, nk pics atm, because errors. Both flat, lockable screwdrivers wich are at most prying tools. So, i made chisels. Grinding and stones afterwards. No complaints. They don't look perfect, but in time with sharpening, they will.
Best way to sharpen a chisel, = carefully.