Having trouble creating a new action

Hi,
I'm working on a new imagecache action. I based the work off of this issue: http://drupal.org/node/525852.

I believe that I've properly created the module, and used other actions as the guide for this one, but for some reason when the module is enabled the action doesn't show up under the list of actions that can be added to a preset.

I've tested on a development site with a number of modules enabled, and on a fresh install with only core modules, imagecache, imagecache_actions, and this module enabled.

Any help you can offer with this would be really great.

Here's the code:

imagecache_flip.info:

name = Imagecache Flip
description = Flip an image vertically, horizontally, or both.
dependencies[] = imagecache
package = ImageCache
core = 6.x

imagecache_flip.install:

/**
* @file
* Ensure Imagecache recognises our new actions, per http://drupal.org/node/290101.
*/

function imagecache_flip_enable() {
  cache_clear_all('imagecache_actions', 'cache');
}

function imagecache_flip_disable() {
  cache_clear_all('imagecache_actions', 'cache');
}

imagecache_flip.module:

/**
* Implementation of hook_imagecache_actions().
*/

function imagecache_flipx_imagecache_actions() {
  $actions = array(
    'imagecache_flipx' => array(
      'name' => 'Flip Image Horizontally',
      'description' => 'Flip your images horizontally!',
    ),
  );
}

/**
* Declare dummy form, since we have no settings.
*/

function imagecache_flipx_form() {
  $form = array();
  return $form;
}

/**
* Implementation of hook_imagecache_image().
*/

function imagecache_flipx_image(&$image, $data) {
  $size_x = imagesx($image->resource);
  $size_y = imagesy($image->resource);
  $temp = imagecreatetruecolor($size_x, $size_y);

  //use this line to flip image vertically (upside-down)
  //$x = imagecopyresampled($temp, $image->resource, 0, 0, 0, ($size_y-1), $size_x, $size_y, $size_x, 0-$size_y);

  //use this line to flip image horizontally (right-left)
  $x = imagecopyresampled($temp, $image->resource, 0, 0, ($size_x-1), 0, $size_x, $size_y, 0-$size_x, $size_y);

  if ($x) {
    $image->resource = $temp;
  }
  return $image;
}