I´m done.
Changing a defect and bend Overwritehead from a NH900 (right one) to a good one from a RH910.The previous owner stated he did open it during a hangtime from SoS.The head was down at that time and that idiot tried to eject the disc.That´s why its bend all the way up.
Now the NH900 records again was kinda hard but now iam glad it worked.