What is the practical maximum weight that piece 67139 can support?

I am working on a large aircraft that weighs just under 5 kg, and the stand I was originally going to design turned out to be above my ability to design well in Studio. Rather than reverting to a more boring stand, I've thought of using multiple 67139's to hold the model in place on my wall (all would be stacked in a pile with a large screw acting as support). I would integrate these into the technic frame so all the stress should be on these parts. submitted by /u/undecided_mask ...