The coils have a small ridge on the inner sides and at the edges. So this went after insertion simply not clear what led to increased lower thread tension. Why there is not the full star. However, these ridges were beseitig a few simple steps, so that it then rolled off super. I especially like the hinges of the small box. These were not easy as expected articulated hinges, but real nested parts that break away even after repeated opening and closing.
