To answer the question about the adjustment bolt...My Dad owned a sharpening business for several years and did scissor sharpening. If you look at the OP picture of the scissors (bottom image) you can clearly see the bolt and the space between where the two sides of the scissors come together. Part of the professional sharpening process is to make sure all of that area is clean, oiled and aligned correctly. Or I guess I should say that is what his process was.