PST LCA Shaft question

So... finally getting around to installing the LCA on my 73 chally, went with the PST lower control arm shafts. The problem is, when I try to tighten the nut, the shaft spins. I definitely dont like the nut with the three dimples. I understand the reasoning, but does anyone know the thread size for that? And also, what am I doing wrong with this install. Why does the shaft just spin. Note: I do not have the Torsion bars mounted yet. Was thinking maybe I should do that first , as it would...

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Author: Moespar