Remove B&G 213 Wind Sensor?

[s/v Jedi]

We have trouble taking the sensor off the mast. It's hard to see everything well while in the bosuns chair and I think the thing is stuck. Can anyone confirm if this is a straight screw-on-ring or a more elaborate push-and-turn bayonet type connector?

Right now we can turn the ring a bit each way until it stops hard. We can't see if the part attached to the mast turns as well or not.

Strange as it is, I couldn't find this info anywhere on the Internet.

thanks,
Nick.