The problem tower is repaired. The flanges did not fit. This was a mistake made by the tower builder.
Adriaan PD4AK cut a few flanges from the tower and welded them back in a correct way. Now everyone fits and I can mount the ring and the rotator and bearing plates. And off course the rotator itself. The tower can turn but the top yagi can also turn.
Repaired tower
Adriaan PD4AK (right) with the rapaired tower.