How do I know if the Maestro Sport is installed tightly enough in my vehicle?

The child restraint must not move more than 25 mm (1 in.) side-to-side or front-to-back at the belt path. If it moves more than this, the installation is not tight enough and you should try again, move it to another seating location, or switch installation methods. Serious injury or death may result from poor installation. (Page 24–26)