Only problem is that the prethreaded rods are threaded using a rolling process not a die. The diameter of the wire is smaller than the thread and the wire will not take a die and give you a full thread. I would like to know where you can get pre-threaded push rods that you can cut to length and rethread the end with a die and get a full depth thread. I have used the rod-chuck system with a welding rod and a two step die- threading process where you can get a full depth thread either 2-56 or 4-40 threads. That way I can make my own push rods to any length.