I tried posting before, seems I messed up.
My PB is new out of the box, tried it for 15mins to 10200 so far.
In video's, the balls are just zooming, mine's rattling, or whatever you call it in English. FAQ states something about "knocking" sounds after a hard impact. I see about 0.5mm of play in the core you push to a start. Normal or panic? Mine came postorder...
Thanks in advance!