Just a random note to go along with this thread. Every time a person has a wind speed issue, the first recommendation is to "remove your wind cups and reinstall them". I don't understand the thinking here. The wind cups are designed to slide onto a spindle, and are then secured by tightening a set screw. Very common design used in dozens of other applications. Well, you've basically got two options here. A) The set screw will be loose and/or cups not slid onto the spindle far enough either of which will cause the cups to fall off the spindle. May not happen immediately, but it will happen. B) The cups are slid onto the spindle far enough and the set screw is tight, which means the cups are turning the spindle.
It's a pretty fool proof design. I don't see how the plastic cups could possibly spin on the metal spindle, at least not for any significant period of time, without turning the spindle. To me, the cups are either on correctly or they're not. You're going to know as soon as you walk up to the station whether you've got a problem with your wind cups.
Also I discovered that the allen wrench is a 5/100" wrench. Good luck finding one of those at a hardware store.