On all of the Nott tonearms that I have ever used, the headshell is simply press fitted into the carbon fiber armtube and will rotate. It is not easy to get it right, and it's hard to avoid using too much leverage and substantially twisting the damned headshell to a severe angle, but it can be done. Just make sure that you don't pull the headshell out of the armtube (unless you really mean to do so) or you will risk ruining your day and breaking one of the hair-fine tonearm wires.
Have fun.
Have fun.