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there are black plastic pieces that are on screws so you twist the black piece to angle up or down. sorry if thats a bad explination but youll see what im talking about when you take them out
I watched Patrick adjust one, and as I recall, there is a metal locking tab that has to pulled up. This frees the plastic tabs to be adjusted on the screws.
if you can figure out a good way to do it, without using a tool, let me know. you can even do a write up in the HOW TO section, and get promoted to Technical Article Contributor