diff --git a/dir2cast.php b/dir2cast.php
index 2b41c7c..f91f33e 100644
--- a/dir2cast.php
+++ b/dir2cast.php
@@ -125,6 +125,7 @@ public function __call($method, $params)
 }
 
 interface Podcast_Helper {
+    public function id();
     public function appendToChannel(DOMElement $d, DOMDocument $doc);
     public function appendToItem(DOMElement $d, DOMDocument $doc, RSS_Item $item);
     public function addNamespaceTo(DOMElement $d, DOMDocument $doc);
@@ -135,7 +136,10 @@ public function addNamespaceTo(DOMElement $d, DOMDocument $doc);
  *
  */
 class getID3_Podcast_Helper implements Podcast_Helper {
-
+    public function id()
+    {
+        return get_class($this);
+    }
     static $AUTO_SAVE_COVER_ART = false;
         
     public function appendToChannel(DOMElement $d, DOMDocument $doc) { /* nothing */ }
@@ -206,6 +210,10 @@ public function appendToItem(DOMElement $d, DOMDocument $doc, RSS_Item $item)
  *
  */
 class Caching_getID3_Podcast_Helper implements Podcast_Helper {
+    public function id()
+    {
+        return get_class($this);
+    }
 
     protected $wrapped_helper;
     protected $cache_dir;
@@ -267,6 +275,10 @@ protected function saveToCache($filename, Serializable $item) {
 }
 
 class Atom_Podcast_Helper extends GetterSetter implements Podcast_Helper {
+    public function id()
+    {
+         return get_class($this);
+    }
     
     protected $self_link;
     
@@ -312,6 +324,10 @@ public function setSelfLink($link)
 }
 
 class iTunes_Podcast_Helper extends GetterSetter implements Podcast_Helper {
+    public function id()
+    {
+        return get_class($this);
+    }
     
     static $ITUNES_SUBTITLE_SUFFIX = '';
 
@@ -554,7 +570,7 @@ public function appendToChannel(DOMElement $channel, DOMDocument $doc)
     
     public function addHelper(Podcast_Helper $helper)
     {
-        $this->helpers[] = $helper;
+        $this->helpers[$helper->id()] = $helper;
         return $helper;
     }
 }
@@ -978,7 +994,7 @@ abstract class Podcast extends GetterSetter
     
     public function addHelper(Podcast_Helper $helper)
     {
-        $this->helpers[] = $helper;
+        $this->helpers[$helper->id()] = $helper;
         
         // attach helper to items already added.
         // new items will have the helper attached when they are added.
@@ -1415,7 +1431,7 @@ protected function cache_is_stale($cache_date, $most_recent_modification)
      */
     public function renew()
     {
-        touch($this->temp_file); // renew cache file life expectancy        
+        touch($this->temp_file); // renew cache file life expectancy
     }
 
     public function uncache()
diff --git a/test/Dir_PodcastTest.php b/test/Dir_PodcastTest.php
index 39eec7b..b6e3772 100644
--- a/test/Dir_PodcastTest.php
+++ b/test/Dir_PodcastTest.php
@@ -165,9 +165,11 @@ public function test_helpers_added_to_found_items()
         $mp = $this->newPodcast();
 
         $helper = $this->createMock(Podcast_Helper::class);
+        $helper->expects($this->atLeastOnce())->method('id')->willReturn('Mock1');
         $helper->expects($this->exactly(4))->method('appendToItem');
 
         $helper2 = $this->createMock(Podcast_Helper::class);
+        $helper2->expects($this->atLeastOnce())->method('id')->willReturn('Mock2');
         $helper2->expects($this->exactly(4))->method('appendToItem');
 
         $mp->addHelper($helper);
@@ -185,9 +187,11 @@ public function test_files_added_to_podcast_obeys_ITEM_COUNT()
         $mp = $this->newPodcast();
 
         $helper = $this->createMock(Podcast_Helper::class);
+        $helper->expects($this->atLeastOnce())->method('id')->willReturn('Mock1');
         $helper->expects($this->exactly(2))->method('appendToItem');
 
         $helper2 = $this->createMock(Podcast_Helper::class);
+        $helper2->expects($this->atLeastOnce())->method('id')->willReturn('Mock2');
         $helper2->expects($this->exactly(2))->method('appendToItem');
 
         $mp->addHelper($helper);
diff --git a/test/PodcastHelperTest.php b/test/PodcastHelperTest.php
index 2409039..51e8cf1 100644
--- a/test/PodcastHelperTest.php
+++ b/test/PodcastHelperTest.php
@@ -13,9 +13,11 @@ public static function setUpBeforeClass(): void
     public function test_helpers_applied_to_newly_added_items()
     {
         $helper = $this->createMock(Podcast_Helper::class);
+        $helper->expects($this->atLeastOnce())->method('id')->willReturn('Mock1');
         $helper->expects($this->exactly(2))->method('appendToItem');
 
         $helper2 = $this->createMock(Podcast_Helper::class);
+        $helper2->expects($this->atLeastOnce())->method('id')->willReturn('Mock2');
         $helper2->expects($this->exactly(2))->method('appendToItem');
 
         $mp = new MyPodcast();
@@ -34,9 +36,11 @@ public function test_helpers_applied_to_newly_added_items()
     public function test_helpers_applied_to_already_added_items()
     {
         $helper = $this->createMock(Podcast_Helper::class);
+        $helper->expects($this->atLeastOnce())->method('id')->willReturn('Mock1');
         $helper->expects($this->exactly(2))->method('appendToItem');
 
         $helper2 = $this->createMock(Podcast_Helper::class);
+        $helper2->expects($this->atLeastOnce())->method('id')->willReturn('Mock2');
         $helper2->expects($this->exactly(2))->method('appendToItem');
 
         $mp = new MyPodcast();
@@ -57,9 +61,11 @@ public function test_helpers_applied_to_already_added_items()
     public function test_helpers_given_opportunity_to_add_namespace()
     {
         $helper = $this->createMock(Podcast_Helper::class);
+        $helper->expects($this->atLeastOnce())->method('id')->willReturn('Mock1');
         $helper->expects($this->once())->method('addNamespaceTo');
 
         $helper2 = $this->createMock(Podcast_Helper::class);
+        $helper2->expects($this->atLeastOnce())->method('id')->willReturn('Mock2');
         $helper2->expects($this->once())->method('addNamespaceTo');
 
         $mp = new MyPodcast();
diff --git a/test/RSS_Item_getID3_Podcast_Helper_AUTO_SAVE_COVERTest.php b/test/RSS_Item_getID3_Podcast_Helper_AUTO_SAVE_COVERTest.php
index 420af84..74d42eb 100644
--- a/test/RSS_Item_getID3_Podcast_Helper_AUTO_SAVE_COVERTest.php
+++ b/test/RSS_Item_getID3_Podcast_Helper_AUTO_SAVE_COVERTest.php
@@ -72,7 +72,7 @@ public function test_auto_save_doesnt_create_spurious_helper_duplication()
         mkdir('temp');
         $mp = new Cached_Dir_Podcast('.', 'temp');
         $mp->init();
-        $getid3 = $mp->addHelper(new Caching_getID3_Podcast_Helper('tmp', new getID3_Podcast_Helper()));
+        $getid3 = $mp->addHelper(new Caching_getID3_Podcast_Helper('temp', new getID3_Podcast_Helper()));
         $atom   = $mp->addHelper(new Atom_Podcast_Helper());
         $itunes = $mp->addHelper(new iTunes_Podcast_Helper());
         $content = $mp->generate();
@@ -84,7 +84,7 @@ public function test_auto_save_doesnt_create_spurious_helper_duplication()
 
         $mp = new Cached_Dir_Podcast('.', 'temp');
         $mp->init();
-        $getid3 = $mp->addHelper(new Caching_getID3_Podcast_Helper('tmp', new getID3_Podcast_Helper()));
+        $getid3 = $mp->addHelper(new Caching_getID3_Podcast_Helper('temp', new getID3_Podcast_Helper()));
         $atom   = $mp->addHelper(new Atom_Podcast_Helper());
         $itunes = $mp->addHelper(new iTunes_Podcast_Helper());
         $content = $mp->generate();