For your 62" slow rise roller shade in the 2023 Montana High Country 331RL, the replacement spring should match the original specifications, including tube diameter and spring tension. The commonly recommended part is the Irvine replacement spring with a 3/4" tube diameter, but since your measurement is closer to 1", ensure you select a spring compatible with that size. If the shade still does not retract after installing a new spring, it could indicate internal mechanical issues or installation errors rather than the spring itself. We recommend verifying the spring assembly compatibility carefully and reviewing installation steps. Additionally, consider inspecting the shade tube and mechanism for any damage or obstructions. You can browse our selection of roller shade springs at ElkhartRVParts.com to find the exact fit. For further technical advice, contacting the shade manufacturer, Irvine Shade, may provide detailed guidance tailored to your model. If you need assistance selecting the correct part or troubleshooting installation, our team is ready to help ensure your shade functions smoothly without replacing the entire unit.