Yours, Etc.: Origins and Uses of 8 Sign-Offs
also make-weight, 1690s, "small quantity of something added to make the total reach a certain weight," from make (v.) + weight.
MAKE WEIGHT. A small candle: a term applied to a little slender man. ["Dictionary of Buckish Slang, University Wit, and Pickpocket Eloquence," London, 1811]