An assembly of a dash for a vehicle includes a first plate and a second plate movable along an axis away from the first plate. The second plate moves from an undeployed position to a deployed position. The assembly includes a spring between the first plate and the second plate that biases the second plate toward the deployed position. The assembly includes a post extending along the axis from the second plate through the first plate. The assembly includes a pin releasably engaging the post with the first plate in the undeployed position. The assembly includes a release supported by the first plate and connected to the pin. The pin is disengageable from the post transverse to the axis by the release.