Hello Pilou , 
 
Thank you for the tutorial of the picture insert in Moi . I sometimes worked like this in 2d cad . 
When you know certain measurements of the instrument or object in real you can scale the drawing to that and draw a real life instrument based on a picture .  
It goes much faster in Moi than in my other cad programs . 
 
Greets , 
 
Paul 
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