i wonder if someone could help me with some pushrods i am making . i have some threaded rods from great planes . the tread is 4-40 and it is about an inch from the end. how do i cut new threads at the other end?i am thinking of buing a 4-40 tool but , do you think that the diameter of the rod will let me cut the threads? i noticed that the rod i slightly smaller i diameter outside the threads area. i know that these cuting tools require i larger rod , so to cut the thread. i assume that the original threads made by presure and not by cutting. thats why they use smaller diameter rod. but will i be able to cut new at the other side or to abandom the idea ?