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Take a lockpicking set and from this a raking tool and a tensioner and if you unlocked it you must push with a pointed and small tool like a shank or a hook the deepest disc to the edge. After this you can move the core out of the barrel. The function of the deepest disc is only to hold the core in the barrel.
Also u can use tools called Jiggler. It's fast and you did not need much experience for this opening method. Here is a movie from Locknoob who show's like it works. https://youtu.be/HkMmuT94B_Y
Or you come to the next GPZ meeting and I'll show you how it's done.