Sparrow Locksmithing Tools have introduced a great bypass tool for Masterlock PadLocks (#1, #2, #3, #4). When you insert both of these switches deep into the keyway of the lock you are able to open the padlock. Sparrow reports that with the help of shims you can even open the master padlocks #5 and #6.
The Sparrow Lock Pick master switch is an awesome tool for the kit and a great way to get past the build in weakness of the lock. The community is raving this tool as a universal key for the padlocks able to open any of these padlocks in the defined series above. Your janitor key to the master of padlocks.