doug, you seem to be rather out spoken on this subject but I have yet to see you direct any of us to "printed" and "documented" material to support your claims.
I would feel a whole lot better about this subject if you would provide a website or name of a book that indicates the official documented concerns with Zinsco breakers/panels.
I request this on behalf of my clients and myself, all of whom are purchasing home, many of which have these Zinsco products in them.
Thank you kindly.