The Irvine Replacement Springs for Valu-Line RV roller shades are typically non-returnable as shades are considered custom made to order. However, exceptions can be made. In this case, a return label has been issued for your 3/4" Version spring to facilitate a return and exchange for the 1" Version. Please ensure the item is returned in its original condition with all packaging. Once the return is processed, you can place a new order for the correct spring size. For any questions or assistance, contact customer support to guide you through the process.