The Gen 3 vises have pads located at the upper, outboard corners to grip the blade, and there is some flex built in to the design to allow the vise to conform to variations in blade configurations. Current models also have adjustable clamping force to aid in adapting to variations in blade thickness.
High school physics taught us that clamping effectiveness is a function of force and not area and the pads use this to their advantage. However, the coefficient of friction between vise pads and the blade surfaces is also a factor. This means that polished surfaces (as is found on most quality knives) may tend to be less than ideal. For this we recommend any of a number of alternatives. Some use masking tape, some use chamois leather and I use aluminum foil ducting tape. A small patch of the material of your choice applied to the area to be clamped works wonders. If it sticks to the blade surface, you’re home free. Most of us use the various tapes primarily to protect the knife faces from accidental scratches than for the secureness (?) of the blade mount.
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