The product seems  like it was shipped with the wrong part and thus was incapable of being assembled. (I verified with the support team.) As you can see from the photo, the threading at the top of two tubes that create the shaft had no corresponding threading to screw into. The parts are all strung together on the cord, so it's not as if I could place them out of order, and everything else assembled fine.

I got a refund, but they don't accept returns, so now I have to deal with this landfill.