Finally everything works. Was very lucky to find an almost unused motor today at a mb dealer which is closing down. https://www.dropbox.com/s/j6o6b6a7wuldk8n/File%2004.08.2016%2C%2019.59.58.jpeg?
Put everything properly back together. Spendt the most time putting the stupid rubber half moon around the wiper in place. Kind of tricky to get it right.