Pics should do the trick. Here are two I have in my collection. One is an original, the other a repop. (Just ignore that the original doesn't have the black push button installed). You'll find repops with threaded holes and non threaded holes/set screw, so that doesn't help. For me, I've noticed the metal bridge between the two wooden pieces are flat on originals and curved on later repops. There may be reproductions that have flat features, but I haven't seen one yet. Perhaps someone with more experience can weigh in.