How do I know if my child restraint installation is tight enough?

The child restraint must not move more than 25 mm (1 in.) side to side or front to back at the belt path being used. To test this, try moving the restraint in all directions at the belt path after installation. If it moves more than 25 mm (1 in.), the seat belt or lower anchor connector strap is not tight enough and you must re-install or move it to another location. (Pages 23, 27)