Have contacted the manufacturer because the latter "problem" and now waiting for a reply. Let's see what this says. When I know more, I write it immediately into my Rezesion. Now I got from the seller feedback. The customer has sent back to me a very nice email that send this to me a replacement part (for free!). This they did, but unfortunately it has been found that all parts are equal. But when I give you this telling, was the answer that we can keep the spare parts calm and even have us a 5, - granted discount. So the customer ago everything was great! Just a shame that one part does not fit. But still a beautiful cat tree.
By the time you get used to the fact that the last part does not fit, then it is also no longer bad. So I can only recommend the scratching post. Especially also because the cups are very large, so that even our great hangover disappears therein. So highly recommended.
Therefore, and I just have to give 5 stars.