Aha, obviously Im not alone..
Not as I though, support bush out of position 2h was the only root course..the crack must have begun much earlier..in fact increased crack/untrue must have moved the support bush out of position..
Found very detailed messages with nice photos here, regarding broken/replaced D3 LH main shaft, thx!
Most likely this is a maintenance part then?
Probably my D5 ~1957 shaft has been running at overtime for X-years..~100h by me this season
BR,