This is odd, never happened to me and I done hundreds of Am Flattop (the Berea version). Normally the transmission is pressed onto the brass finial part (that is pressed into the brass tube of the upper barrel)and thats how the doubletwist mechanism is operated. The transmission should normally not be ostructed by the tube or else, and there is no need for glue. Make sure that the twist mechanism is tightly pressed to the brass part.