After having seen low wind speed readings for a while I decided to bring down the wind sensors.
Looking at the speed sensor it was obvious this was sticking.
It seemed the only option would be to replace the whole assembly.
However after finding this, which is a huge saving over buying the whole assembly (oh and I also got the Tiny Allen key as it was put away for safe keeping 6 years ago and lost)
Order place and arrived a few days later well packaged.
Wind sensors all down again.
Remove the wind cups with the Tony Allen Key.
Remove the Speed Cartridge with a Phillips screw driver.
Install new speed cartridge (the new Cartridge also has a cover over the magnet which doesn't need to be removed)
Install back and re-attachbwith Phillips screw and then add back wind cups with tiny Allen key.
Install back to final position.
Despite being a very calm day the wind was detected again at 6mph which was much higher than it has been reading over the past week in windier conditions.
Ironic that since having the sensors installed we haven't had much wind lately.
I'm very happy with the purchase and service.
Steve CM2Weather