Tiredeyes69

I am looking for a solution to installing my anemometer on a 2 meter mast on my chimney, on top of my house. Its currently on 6 mters of 32mm plastic waste pipe, and swaying in the wind I have a velux window around 1 meter wide about 1.5 meter away from the Chimney. I want to install a 1.5 inch diameter aluminium pole with my anemometer on the top or side, but be able to pull it and then have it at a 90 degree angle in front of the velux window, so I can change batteries and change it with out getting on-top of the roof. I am trying to think of the best way to attach the pole to a hinge? the hinge needs to be cheap, and maybe stainless or aluminium, hopefully lasting for around 30 years before I am close to one foot in the grave any off the shelf solutions, or I could engineer something of my own. Just cannot find a good solution to my issue ! Thanks in advance....