Crown height is a fit dimension, not the size of the crown. The movement, holder and case must place the setting stem on the same centerline as the crown tube.
1. Length and height solve different problems. Trimming a stem changes how far the crown reaches. It cannot move the stem up or down to meet the tube.
2. An angled stem is a warning. If the stem must bend or rub to enter the tube, winding and setting can feel rough, and the crown may not seat correctly. Do not force it.
3. Check the final fit before cutting. Seat the intended movement and holder in the case, insert the correct test stem, and confirm a straight, free path. Then set the length. If the centerlines disagree, recheck the exact movement, case and holder specifications.
Watcher Insight: manufacturer documentation lists movements, technical drawings and stem options because compatibility depends on exact references. Start with the TMI NH technical information, then use our complete compatibility guide for the full system.
