The joint between 90 degree elbow and reducer fitting can turn. since we need max 90 degree turning,they wont separate from each other. There is no any lock mechanism implemented yet;
Actually, in monitor terminology, this is pivoting. There are monitors that are advertised with stands that can "pivot" and this is exactly what they do. =)
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The others are threaded galvanized water pipes and the standard joints
There is no any lock mechanism implemented yet;
Pivoting would mean that the screen can be shifted on the X axis - you're only shifting on the Z axis...