Yesterday, we bought two Knoll Sapper monitor arms. Most arms on the market use gas springs to counterbalance the display weight. The Sapper separates vertical motion, which works against gravity, from horizontal motion. Vertically, it uses a screw on the main column and the arm is held by friction. Horizontal motion requires no special mechanism. Gravity exerts no force in that plane, and friction is enough to resist small disturbances.
It’s so simple and so well thought out that I’m surprised it’s not the most popular arm. Its look is the expression of its function and not a gram of material is wasted.













