function _reset_pointer( $id = 'me' ) {
    if ( $id === 'me' ) {
	$id = get_current_user_id();
    }
    $pointers = explode( ',', get_user_meta( $id, 'dismissed_wp_pointers', true ) );
    foreach ( $pointers as $key => $pointer ) {
	if ( strpos( $pointer, $this->prefix ) === 0 ) {
	  unset( $pointers[ $key ] );
	}
    }
    $meta = implode( ',', $pointers );

    update_user_meta( get_current_user_id(), 'dismissed_wp_pointers', $meta );
  }