Replace line 448 and below with this code if you want to rename the Source and Original stacks based on the title of the parent postcard.

hullagraph.php

<?
} else if ($node['parent']->getProperty('type') == 'meta') {
  if (in_array($node['parent']->getProperty('parent'), array('Source', 'Original'))) {
    $parent_mod = Module::getModuleById($node['adjective']->getProperty('title'));
    $new_stack['title'] = escapeForDisplay($parent_mod->lens_module_title);
  }
  $new_stack['url'] = implode('/', array(
    'stacks',
    strtolower($this->getNoun(true, $node['parent']->getProperty('parent'))),
    urlencode(strtolower($node['parent']->getProperty('title'))),
    slug($node['adjective']->getProperty('title'))
  ));

} else {
  throw new Exception('Unexpected node type');
}