To securely reattach the blind fabric to the roller tube on your 2021 Grand Design Imagine RV, it is recommended to use a strong adhesive such as 3M spray glue. This provides a reliable, long-term bond, whereas double-sided tape may not hold adequately over time. When reinstalling the mounting brackets, the method depends on their design. For inside mounts, position the brackets inside the upper corners of the window frame, ensure they are, secure with screws, and then insert the roller blind starting with the control side. For outside mounts, attach the brackets above and outside the window frame so the blind fully covers the window, secure with screws, and insert the roller blind starting with the control side first. If you need replacement springs or additional shade components, you can find them at Elkhart RV Parts online.