So this puzzle it's a really big challange. The autor of the puzzle is Livio Zucca italian matematician. He said: if you do'nt have a hell of luck, you need 3 lifetime to solve it. Theoreticly there is just one solution.
In this case the task was to manufacture hooks from roundbar with a diameter of 8mm, in two lenght. After many trials I managed to make a fixing point at the corner of the slot, and the bending is made from one root (close to the bending point)by a bearing roll with the help of a power-handlebar. The second phase is the breaking of the hookstem so that the already hanged hook should stand vertically to the hanging point. The breaking of the 2 types of lenght is ensured by 2 types drilled powerbars. This process was a challengingly kind and visual one.