i think ive solved it
i disconnected the "pin" that is connected to blade and the other mountpoint on the other place...
it was very easy..
but i got some shims/orings left.. and some screws.
dont know what to do with them hehe
maybe something will throw of the car when i am driving or something...
hmm.. my rearbelt is very slack.. i have the belt tensionsetting as "default"
maybe i should tried "tightest"
but i dont know a solution for easy change that belt tension without taking the whole car apart