The optional 1/4″ wide cam style jaws have a maximum jaw opening just wider than 1/4″, that’s it. This is where the “original” standard vise design is helpful. The standard vise can clamp these very thick knives. Longer vise screws may be needed to allow the standard vise to expand wide enough to hold the thick steel.
Possibly if you have a low angle adapter you can exchange the standard included screws for longer screws to accommodate that thick knife. A Tormek Small Knife Holder may be another clamping option since it holds a knife by it’s handle, not by the thick blade. This adapter will clamp in the standard included Gen 3 jaws.
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