Turn it with the mouse or your finger, scroll to zoom. The remove the screen button slides the unit out of its rail. Every part is the real volume from the model: what you see is what comes out of the printer. The piano and the screws are simplified, only there to make the assembly legible.
The mount clamps onto the body of the piano: the bracket underneath, the clamping arm over the top, and a single M8 screw does the rest. The ball joint tilts the screen 37° up or down, and the unit slides onto a dovetail: it comes off in one gesture, without tools.
3D model served from this site. No call to any outside service beyond the typefaces.