Best way to install compensator?

[LRRPF52]

I normally clamp the barrel without imparting any torque to anything but the barrel and the muzzle device.

I insulate the barrel from the vice jaws with the inserts, and use swede leather to prevent twisting.

I also try not to impart much torque on the muzzle device, but different muzzle devices might require application of thread locking compounds, especially if you are going to brake attach a suppressor.