I have an Ames splitting maul with fiberglass handle. The cutting edge was looking a bit gnarly so I took it to my bench grinder to clean it up and try to put an edge back on it. Now I wish I hadn't because the grinding wheel removed more metal in some spots - it just happened super quick. So I'm thinking that is not the way to do it. The maul is still very servicable and I have continued to use it just fine, but I'm wondering how I should sharpen it? A stone? I'm thinking maybe I should take a sharpening stone to it by hand...?