Hi friends, a little help for your first encounter of this kind of interchangeable Medeco padlock, with the aid of my fabricated tools (these are tools for convenience only) if you are not involve regularly with this padlock, you can skip the tools. a tweezer and a slot plug follower can do to position that main mechanism at the bottom. regards.
http://www.youtube.com/watch?v=5o4Myo42O-A