Bruno Tilz Adapter Cornet - Trumpet

At first sight the Bruno Tilz Adapter Cornet - Trumpet seems great: nice looks, good price, with a big grip for releasing it from the trumpet and mouthpiece, etc. In reality, though, it seems that Bruno Tilz committed a gross design error: the adapter is too short! It enters just a few millimetres into the trumpet mouthpiece and that's it! It leaves a huge gap between the end of the adapter/mouthpiece and the begin of the trumpet leadpipe. Such a huge gap makes the instrument unplayable: all slots above de middle G are gone. For comparison, I have ordered also all other adapters available at Thomann, and the one by Bruno Tilz is the only one that showed this flaw. It is clearly an error in design. That's a pity, because otherwise it could be a good adapter.