Hi Phil,

If you type DMR-Japan into the search bar on you tube, you will see their home page. If you click on videos, you will see various videos on their products including the wide servo pulley you are enquiring about.

There are also other Japanese videos on that specific pulley although the text/language in the videos is Japanese. Perhaps there is a way of uploading the video to a translation app so that you can understand the text in the video.

Sami