The purlins in Ideçelik are thrown on the scissors as in the picture no. 1, on the beams as in the picture no. 2. However, as in the 3rd picture, when the non-reciprocal scissors are manufactured, the left sides remain open. When we offset the lovers, it is offset in both scissors. However, if I could intervene on the 4 sides of the purlins, as in the picture no. 2, I would have solved my openness problem in the 3rd picture.