Here is a picture of the power switch. The retainers are on the top and bottom as the switch sits vertical in the faceplate.
http://livedoor.blogimg.jp/taken81/imgs/6/b/6b8faaba.jpg
http://livedoor.blogimg.jp/taken81/imgs/5/7/57eb6f12.jpg
http://livedoor.blogimg.jp/taken81/imgs/6/b/6b8faaba.jpg
http://livedoor.blogimg.jp/taken81/imgs/5/7/57eb6f12.jpg