Beautiful track with small defects (Verschluckrisiko)

We ordered this ball track for our 17 months old child. Visually and functionally a very attractive marble run.
However, our child has peeled away two small blue hemispheres in a very short time and almost put into his mouth. This blue hemispheres (diameter 2 cm) serve as coverage of the screws on the side panels and are easily visible on the display. On each side there are four of them. You're just stuck.
On our corresponding critical review immediately the concerned producers has contacted us and advised us of the possibility of exchange. But that was in our view not necessary, as the ball track works well without these covers. To compensate, there were the manufacturer an extra toy for your train. According to the manufacturer, very few trains were affected by a production error. But he is not hurt as buyers to consider me, how stuck the covers. In any case, these are a very customer-oriented manufacturer.