COMP Cams Valve Seals 530-8 Don't risk your fingers when removing or installing valve locks anymore. COMP Cams Pro Valve Lock Removal and Installation Tool is definitely the best way to perform this delicate task. To install locks compress the valve spring, place locks on magnetic stem, push the body of the tool over the locks and position them on the valve stem. Then release the valve spring. To remove locks use the magnetic stem to pluck off the valve locks once the spring has been compressed. Lock Remover, 5/16" (Pro) COMP Cams Pro Valve Lock Removal and Installation Tool, for 7mm, 8mm, and 5/16" Locks COMP Cams Valve Seal 5/16in Viton For .4