Before you can go on the camshafts have to arrested. There is a special bridge tool. It is about $100, but it is "cheaply" made: It features only 2 holes. 3 holes is way better. So I quickly cut aluminium strips to my liking with 3 holes. I used 2 strips on each side, each strip 2mm thick. If they can only offer CHEAP for $100, then I do CHEAP without paying money for it! ;) I bought the required bolts and washers.