[updated and corrected] A few weeks back I attended Vincent Cortese's workshop at Mike DaSilva's studio. Vincent is terrific; catch him whenever you can. The two biggest things I learned during the lesson was one, how to do an authentic Smeckian roll stroke (three fingers: pinkie, index, and thumb only), and two, that about the only thing that Roy didn't do to abuse a uke was to smash it on the floor. The cosmetic condition of Vince's vintage Martin (Vincent sez not one of Roy's --ed.) would bring tears to the eyes of any collector.
Vince wrote in the comments (and I'm bringing it to the main page for all readers):
"Hi, good people.. the uke is a long scale soprano made by a company out of Chicago-Wurlitzer.. I was attending a show by the great and wonderful Tomas Kubinek and he called me up to play his uke.. never played this uke before this performance.. it is a gorgeous instrument.. the Martin I played at Mike's did not belong to Roy, but he did give me the Harmony I used at the workshop.. I have had the Martin only about 3 years.. hope everyone gets some measure of enjoyment out of the video.. best to all.."
Vince taught us that Roy's technique (and "uptight" D tuning) was built for showmanship and projection. This was a guy playing for huge theaters. My main point in all this is that you can't be dainty and get Smeck out of your uke. It's a really percussive style that requires aggressive strumming. I'm going to re-string my old beater Hohner mahogany uke so I can really get my Smeck on while I'm learning.
Do not attempt this on your mint condition 5K. Link