You could do without the whole cam mechanism. The 1/2" bolt will provide enough force with a wrench to form good knurls. But savarin and I can tell you that we can get enough pressure by turning the jack screw with our fingers (after the 1/2" bolt is adjusted to suit diameter) to press the dies into the work.
You don't have to use my design. Make your own. That's half the fun of machining.
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