Thanks for the link. It’s good to know of a good ole USA source for new clamps.
I have a pile of old all wood handscrew clamps. Some quite large. I may have one or two that rival Jim’s monster. I do use them.
The parallel variety were a brilliant bit of evolution. I would not not do without my hoard of Wetzler wood parallel handscrew clamps. Most of those took some effort to clean the threads to smooth condition, but worth the effort.