A dedicate bump key for the new ATK + cylinders. These are the newer version of the ATK and do NOT contain trap pins. They can be identified as the cylinder is marked ATK+. These cylinders contain a hidden chamber and a timing pin therefore we have countaracted this by adding special cuts in certain positions. So far we have had 100% success and are yet to find a cylinder that cannot be bumped. Feather light tension is required, and out one or sometimes two clicks. These locks bump better clockwise.