Feuling VVT Camshaft Bolt Torque Reaction Tool For Harley The Feuling VVT Camshaft Bolt Torque Reaction Tool is essential for maintaining the cam phaser assembly's position during the removal and installation of the camshaft bolt, also referred to as the spool valve in models featuring variable valve timing. Features: Cam bolt remover, installer For Milwaukee Eight VVT models Made in the USA