Easy Balancing the Sky-Watcher Az GTI

The Skywatcher Az-GTI is a great little and affordable computerized mount for astrophotography.
But rotation, particularly in the azimuth movement (the RA if you use it in equatorial mode) is often stiff. So stiff that balancing the payload is not possible.
The hard way to fix this is open the mount, tune it, grease it, etc. But for the faint of heart, here is a simple strategy to balance the payload once for all.