ECOWITT HP3501, Руководство по эксплуатации

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Figure 8: U-Bolts and nuts installed
The plate and U-Bolts are not yet needed at this stage but doing this now
may help avoid damaging wind vane and wind speed cups later on. Handling
of the sensor package with wind vane and speed cups installed to install
these bolts is more difficult and more likely to lead to damage.
4.2.2 Install wind vane
Push the wind vane onto the shaft on the bottom side of the sensor package,
until it goes no further, as shown on the left side in Figure 9. Next, tighten
the set screw, with a Philips screwdriver (size PH0), as shown on the right
side, until the wind vane cannot be removed from the axle. Make sure the
wind vane can rotate freely. The wind vane’s movement has a small amount
of friction, which is helpful in providing steady wind direction
measurements.