It seem to be hard to find the correct one..
Here is a site with lots og inside pictures. Maybe by contact (bottom of the page) could be for any help?

The owner / usermanual for WX2/WX400 is downloadable from the site, but it probably won't help you much..
Cheers 🥂
"Success is not counted by how high you have climbed
but by how many you brought with you." (Wil Rose)