If it helps I was a professional chef over a decade and sharpened my knives free hand on water stones before every service got pretty good at (or cocky i guess). Figured i didnt need a guide to sharpen my chisels. Wrong! After basically savaging some poor chisels (at least they were store...
very nice I just snagged a record 71 managed to spot at the bottom of one of those rusty tool lots they some times sell for pretty cheap on ebay. Even without the cutter and the depth gauge I couldn't believe my luck. Ill be reading your post through as a litle guide. Cheers