Yes it's a 4013. I have one on my blue X and it looks the same.Is that a 4013? I don't recall the ribs. I have one with ribs like that but I'm pretty sure it's for an older Mercedes, and half again as deep as any Fiat type hub.
I just replaced the switch cluster. Maybe I can adjust it. I will try.The switch cluster is adjustable to correct the excessive gap you show. Look for the clamp around the steering column , down under the dash.
Is the hub secure on the shaft?
Is the nut down securely, with a few threads showing above after tightening it down?
About 5 threads above the nut.As asked, does the nut seat with a few threads above it?
Doubt it will tighten up any more than thatAbout 5 threads above the nut.
That's for sure. I will move the switch when I get back to Hagerstown around Christmas.Doubt it will tighten up any more than that