I found these pages from the manual which are much clearer and, easy to print graph.

http://www.alexander-schleicher.de/w...TM35_US_HB.pdf

Question for anyone:

How does one calculate or develop what I've seen called (Wedge), (Level Line), (Incidence Board)?
To ensure the fuselage is level, and in this case for the ASK-21 is 1000:52. And also in this case there is no reference of exact placement. Wouldn't it change the level if the board is more forward or more to the rear?