JKS Manufacturing Track Bars / J-Flex Control Arms Flex Joint Rebuild Tool KitThis new tool makes rebuilding the JKS flex joints on track bars or upper and lower J Flex arms a breeze. The kits comes with simple tools that work with both small and large joints. No need for finding random sockets or fumbling with a bench vise to compress the joints. This tool will even work with control arms still partially installed in the vehicle. Installation Instructions No need for finding random sockets or fumbling with a bench vise to