As others have noted, the item is defective
The instructions refer to setscrews in two of the parts, which are meant to stabilize the unit. Put simply, there are no holes for set screws or set screws provided. Also, the instructions to attach part the two part C also refer to set screws which are there, but can’t be connected in the manner  they instruct you to, so, basically, you have a rather tall, potentially unstable tower over your head. Others have complained about this, but I don’t see anything from the manufacturer responding to this.
Rating: 1 stars