The tower release mechanism seems to come up quite a bit. Mine wouldn’t release when pulling and turning and I had to dig in and figure it out so thought I’d share this, hopefully it helps someone at some point. In my case the housing that the pin slides through was too tight and binding against the locking ring on the tower. Just had to loosen it and snug down the big nut and it’s working smoothly now!
https://www.facebook.com/adam.shortland.10/videos/10158687333390958