Tightening wheel spacers...how to keep rotors from moving?

So I jack up my front wheels and I go to tighten my wheel spacers and the rotors are moving and will not let me tighten them so how do I keep them from moving so I can tighten my wheels spacers

 

I used one of my assets (daughter) to step on the breaks while tightening.

 

Ingenious! Lol. I probably would’ve spent 30 minutes trying to McGyver some clamps or something.

 

Put it in 4wd and put it in park?

 

Slide a large screwdriver into the rotor. The rotor will turn until the screwdriver contacts the caliper and stops. From there you can tighten everything down.

Or hold the screwdriver

 

^ this.