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The smaller circle with the indentations does not rotate. It is attached to a block of wood which is connected to the weights by a steel cable and runs vertically inside the aluminum channel.
The outer, big round plate is the rotating element. It holds the canvas and it is connected to the smaller circle through their center by a wooden rod. Ball bearing wheels are attached to the two circles and hold that rod in their inner diameter. The indentations allow me to lock the angle. I also screwed a piece of rubber (that black rectangular shape you see in the back view), which adds friction and helps to sustain the angle.
Those were the things I came up with. Everything else I copied from standard easels I saw in stores.
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