Wind Directional Caps for Wood Chimney systems

Having a wind directional cap or rotary cap can help with smoke getting outside specifically in windy conditions.

[@herrprepper2070]

I would love to have a hat like that.

[@henryyoungjr.9400]

The way you just took the top fitting off. Is there something else that keeps that from blowing off .. please tell me there is

[@joshuabaker4374]

Is there a fastener for the wind directional cap to stay connected to the chimney?