Today we tried to get the rubber out with a press.
We didn't succeed with this simple press.
So we got over to a friend who has a more proffesional press.
After puting 4000kg pressure on the mount we got it loose.
After cleaning with sandpaper we used some grease, and pressed it in at a angle I have seen in most older mounts.
We turned it about 240 degree, so that the used side was up. and inside out.
Mounted the thing back, and all my vibrations are gone.
It seems to be important to mount it in the right angle.