Out of the box, the Spark is missing a cover to protect the gimbal. A cover in situations where the gimbal can come into contact with other objects (like when carrying the Spark in a bag). It’s also handy for keeping the camera free of dust and accidental fingerprints.
This clear gimbal lock and cover protects the camera and prevents it from moving around when the Spark is powered off.
Here’s a video that shows this gimbal lock in action: