Dacron hinges from Tom Morris!
Actually, Central Hobbies has Tettra hinge centering device that works on tapered surfaces, which the Dubro does not do. www.centralhobbies.com/tools/alignment.html#taper
Jim
Edited for fat fingering. Also, I bought the G.P. hinge slotter--used it once and put it away. I can do much better with a No. 11 and a metal fingernail file.