Oops, I mis-typed that. I have a Model 2, not a 3!
Rub was just winging it: some kosher salt, some ground cumin, some Aleppo chili powder, some ground black pepper and some Mexican Oregano. I've used this combination before and liked it. I suppose I should add a little garlic and/or onion powder, too. Maybe some day.
I'd be hard-pressed to give the amounts with any accuracy. All I know is that I mixed up a little too little, so as I applied it, I wished I had a bit more but it wasn't short enough to bother.