Here is an option that requires no metalworking machines. I did use a drill press to drill the handles, but it could be done without one. You don't get the nice cast iron handwheel, but I haven't yet wished for them on this one.
I did splurge and used the precision Acme threaded rod. I don't have any of the regular thread to compare it to, but the handles do run very smoothly on this one.
The handles started out as 2 3/8" squares, and are about 4" long. I had some fears that it would be difficult to tighten them tightly enough, but that turned out to be a total non-issue. I can generate more than enough force to bow the front jaw (1 1/4" x 4 1/2" sycamore, but only 11" between centers).
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