Trying to source adjusting mechanism for studio easel

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Hang on Studio Wall
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Hi folks, I have been asked to make an 'H'' frame studio easel with an adjusting crank that moves the canvas rest up and down the frame. I am capable of making the easel, but I can't source the crank mechanism for raising and lowering the moveable part of the easel. Google doesn't seem to know what I am searching for and thinks I am after an easel, or artists' materials. I have a rough idea how this mechanism functions, but it would be a great help if anyone has such an easel, and who could photograph the gearing and the threaded screw at the rear, so I can see what I need to buy, in order to make a mechanism. So please, does anyone have such an easel they could photograph for me? I really would be grateful for any help at all on this. Many Thanks in anticipation John :-D