There shouldn't be threads on the igniter--just two holes. This allows the igniter to fasten securely to the heat sink. If the igniter's holes were threaded, it would not work. This is an important point and lesson for you. The holes in the original igniter were not threaded, either. You don't want the piece you are mounting to have threads--it won't tighten as much otherwise. This is a basic mechanical engineering principle.