Custom form tag function not populating value

Created custom tag, works and show as expected, problem is value isnt populated, here is the code:
function custom_add_form_tag_text() {
wpcf7_add_form_tag( ‘f_price’, ‘text’, ‘custom_add_form_tag_handler’, array( ‘name-attr’ => true ));
}
function custom_add_form_tag_handler( $tag ) {
global $post;
$jcat_stored_meta = get_post_meta($post->ID);
$forklift_price = $jcat_stored_meta[‘_forklift_price’][0];
$output = ‘<input type=”hidden” name=”f_price” value=”‘.$forklift_price.'” class=”wpcf7-form-control wpcf7-hidden”>’;
return $output ;
}

and the form tag
[hidden f_price]
you can see the field shows up inspectign the page, but the value is empty?
any help appreciated.
Jeff

The page I need help with: [log in to see the link]