Shopping had to be done; I just can't go to the school store to get this stuff; I have to go across town to the last photo store in town; then go to the grocery store. Developer has to be Dektol for light magic, and fixer must not be rapid. The grocery store provided me with powderded detergent and unflavored gelatin.
I bought a book from bwpublishing called Dry Plate Photography by Professor Towler 1865. I never knew dry plate photography was that old. The book is on CD.
Some old photo dry plates were cleaned of the emulsion then the sharp edges were sanded with 120 diamond grit. They are MUCH better now.
Those plates were loaded and unloaded in plate holders to practice many times.
My repairs still work on the 4x5 lens while those done by the "professional" do not; the repairs on a 5x7 lens of the same type do not work either. The cylinders need to be polished, that's all. He sent a very bad email to me. Most unpleasant.