> I think that you'll find that the biggest real world improvement that the
Kidney  shaped hole provided was that it was patentable (patent #1918750.) it
was to more securely anchor the cutter to the frog so Stanley could write ad
copy that went something like:
> "...plus our new, patented, lever cap design does a better job of keeping the
 adjustments that you've made ...."
>
> Then again maybe I'm just getting too cynical in this age of marketing BS.
>
> -Ken

Sorry Ken, not cynical, just a marketing brain running normally...