Hello,

Just a great deal of trial and error. The Wikipedia article on screw threads helped me a great deal to realize that instead of having to use a calculator for anything all that was needed was the base pitch number and everything else is ratios. I also thought it would be good to have MoI do the precise calculations for me rather than rely on pen and paper. FelixPQ was kind enough to send me some engineering handbook scans as well for reference.