How to make Curtain wall spiders to have only two arms

[Anonymous]

I am trying to make a curtain wall with spider junctions where every second column of panels would be shifted [like in the picture].

Do You have any idea how to make those spiders to hold glass panels only in the corners, so I could use only two armed spiders?

[Laszlo Nagy]

You would have to modify the GDL Object that is used by the Curtain Wall for the spiders. You would have to open it and modify its scripts.
But that requires some GDL knowledge.