I use 5 and 6-inch Victorinox boning knives and 8 and 10-inch breaking knives which are quite a bit wider than the boning knives.
I have a setup with a block and a measuring ruler and Most knives can handle the 125 mm protrusion.
I just put the knife in the kj 45 jig and before I tighten it up I push it against the block to get a consistent 125 mm protrusion and push down on the jaws so it can't move and tighten up the screw.
I usually do anywhere from 10 to 30 knives at a time this way and its fast and repeatable.
The only issue I've had is on the thicker victory knives but it can also work on them
I have a setup with a block and a measuring ruler and Most knives can handle the 125 mm protrusion.
I just put the knife in the kj 45 jig and before I tighten it up I push it against the block to get a consistent 125 mm protrusion and push down on the jaws so it can't move and tighten up the screw.
I usually do anywhere from 10 to 30 knives at a time this way and its fast and repeatable.
The only issue I've had is on the thicker victory knives but it can also work on them