When cutting and preparing a stem to be fit to a crown, the stem must be handled in a way that no damage is done, especially to the threads, hubs, and other working surfaces. The end of the threads that will be attached to the crown must be clean, not have any raised burrs, and must not come to a sharp point. A thread-locking compound is usually applied to the threads to help secure the crown to the stem. The threads inside the crown must also be clean and free of any debris.
