The TwinPower 488713 inner primary bolt retainer is designed to secure primary bolts on Harley Davidson FX models from 1971 to 1977, including FX Super Glide, FXE Super Glide, and FXS Low Rider. This component effectively prevents inner primary bolts from loosening during operation, ensuring reliable performance and reducing maintenance needs. By eliminating the need for safety wire, it simplifies assembly and service procedures for motorcycle enthusiasts and mechanics alike. Crafted for durability, the retainer is made from high-quality materials to withstand the stresses of powersports riding and provide long-lasting security. This retainer fits a range of 4-speed models, offering a versatile solution for vintage Harley Davidson bikes. Its precise design ensures a secure fit, maintaining proper tension and alignment of the primary components. Installation is straightforward, making it a practical upgrade for restoring or maintaining classic Harley Davidson motorcycles. The retainer is an essential part for those seeking to enhance the safety and reliability of their bike*s primary drive system. Designed to meet the demands of powersports applications, the TwinPower inner primary bolt retainer combines quality and functionality in one package. Whether you are a restoration expert or a daily rider, this part provides peace of mind by keeping critical bolts tight and secure during rides. Trust TwinPower to deliver performance-driven components that meet the needs of vintage Harley Davidson motorcycle owners and restorers alike. Features: * Prevents primary bolt loosening for Harley Davidson FX models from 1971-1977 * Eliminates the need for safety wire, simplifying maintenance * Designed for durability and long-lasting performance in powersports applications