Join Date: Dec 2015
Location: Swindon, England
I think it definitely needs securing at the bottom whatever the pole is made with. With it being fixed at just the top, the pole will act as a lever - and if the cats jump up onto the bottom platform, their forward motion will be amplified by the pole, and I would think runs the risk of tearing out the ceiling fixings.
A large heavy block at the bottom that is big enough to stop the pole swinging may help, but I would still be wary.
Maybe turn the swinging into a feature, and fasten at the top with some fixings that allow this?