Thank you, Pascal, for your reply! Do you think that the same amount of weight is used for the thighs in Savasana? I wanted to use a weight for the strap jacket for shoulder traction, but I think 20 kg would be definitly to much 
. But that would definitly lead me to learn drop-backs 
. I think the weight used for shoulder traction would be around 5 kgs.
So, thank you again, Pascal, also for your advice! I hope you are ok. now!
Namaste Rita
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; you can really hurt yourself if you make a mistake. Even with my teacher advice , i had a problem because i tried a tiny little modificiation on the exercise : a smaller blanket than usual under my back 
... well ,i was fine until the next morning when i woke up 
: i walked like a duck for a week and had to use yoga ropes for restorative exercises beacuse my sacro-iliacs where inflamed 
... now i do the same exercise again until a can do it porperly without any weight. a last thing : don't worry, it is a very pleasant sensation to have that weight, much more relaxing that trying to put your knees on the floor in supta virasan without it 
