Thank you for your suggestions, guys. After all I diagnosed the problem as worned points. The arms did not move at all. I waited till Monday and went to buy new to local MB stealer. Their price is 128 bucks per piece, so I better reset mine old ones and was back in business. Car started and run OK to get us into local Monterrey shop specialised in old cars, including MB. After talking with an owner a bit I could see he knows these cars, so I let his shop to set the points for me.
1 hour and 120 bucks later we were back on road and car run better than before. Thank you Classic Coach Works at Monterrey, CA.
To not let us enloyed the drive too long without an adventure, some 200 miles later the membrane of the brake booster ruptured. But that is another story.
Thanks to everybody who chimed in,
Martin