During yesterday's garage sales, I came across this ingenious clamp that works on friction, angles and leverage. Like a pipe clamp, the sliding arm adjusts to almost snug. Then a quick flip of the eccentric lever exerts the extra 3/8" of motion required to secure that which desires to be steadfast.
Pat. Feb. 8 87 - I suspect this clamp was not patented in 1987.
Join me in celebrating Feb. 8 as Eccentric Clamp Day.