
But, have you seen inside ?
Can you work out where the shim goes ?

Locked, but notice the gates are lined up, and the fence will drop in as soon as the shackle is pulled:

Open:

Hope this helps you visualise whats going on. This is actually a copy of a master lock, it has no false gates. It was made in about a hour, by grinding off the back edge all the way round, then copying the back plate in perspex/acrylic. Then the glue gun came out. Still works, and is about as secure as the original.

G.