Well I was taking a look for ya, and like yourself, I couldn't find anything schematic wise for that guy.... So, what I would suggest is emailing the manufactor and seeing if they could help you out with it. I was looking for an email for ya for Harley Benton and found they are owned by a larger music instrument company Thormann out of Germany and Denmark. There website is here. They should send you one without to much problem. Maybe leave out the detail you want to mod it just for the 20 questions they will throw at you... I would have gotten an email for you, but I don't have a translator for German on here and to lazy to go and get one. Hope this helps some atleast.
