Based on a great article in Shopnotes detailing the construction of an etau, a historical vise from France, I made screws for my Moxon vise using acme threaded rod from McMaster-Carr and shop made hexagonal handles. The cost was $32 and some scrap pieces of red oak.
Construction details on my blog if you are interested. I highly recommend the magazine article. They claim it's their best bench accessory ever and, even though I just used a concept they showed for my Moxon vise, I found it very interesting. I may make an etau some day.