did anyone ever take Roy's class on the "Magical dovetail mallet?"
his new book, "Calvin Cobb: Radio Woodworker" Comes with a measured drawing of the mallet. Legend has it, playing the following video backwards one can hear the secret to cutting the joints without fail, every time.
http://blog.lostartpress.com/2014/11/26/roy-underhill-reads-calvin-cobb-radio-woodworker/