The part I have described, I received from heliconwear in exchange, as had struck the castle in the original model. In addition, the exchange model was far better mounting hardware while (apparently a revised version). My complaint was handled easily, quickly and extremely friendly from heliconwear. They sat down with me even twice by phone. With the new top case also a return slip for free returning the defective model has been sent.
In summary: A top case, where the price / performance ratio absolutely is okay and a great service from heliconwear!