RE: threading pushrod
No, it's just about impossible to do that. The threads on pushrods are rolled into the metal instead of being cut. If you try to cut the threads using a die (if you could do it at all) you will find that they would not fit in the clevis you were trying to use. If you want to attach a clevis to the pushrod simply get a solder clevis and solder it to the pushrod.
Ken