Enhance your HO scale model trains with these high - quality Kadee 621 torsion springs. Specifically designed for the 30 series gearbox, a pack of 12 springs gives you enough spares for smooth operations. Part # 380 - 621 ensures perfect compatibility.

These torsion springs are super easy to use. First, make sure your model train is turned off. Then, carefully remove the old spring from the 30 series gearbox and replace it with a new Kadee 621 spring. When handling the springs, be gentle as they're delicate. Store the extra springs in a dry place to prevent rust. If you notice the train's performance dropping, check the springs to see if they need replacing.