Printing used to be one of my hobbies. I have an antique hand operated platen press (letterpress) complete with metal types (fonts) and accessories. I have not done much letterpress printing since the desk top computer came in.
In letterpress printing, the metal types are assembled in words and sentences and clamped down in a metal frame. The devices used to clamp are called quoins.
Very often ideas pop-up from the most unlikely places. The quoin is thought of as a device related to printing. Thinking however “outside of the box” quoins can be used in wood working as well.
-- Ed "Real happiness is one that you share."