1. Left drag the objects arrowed in the following diagram to alter their positions to achieve new equilibriums.
2. Right click (or control + left click) anywhere and then drag to translate the whole system.
3. The beam is capable to be turned to any, but not a (nearly) vertical position.
4. The mass of the beam and of the spring balance are neglected.
5. If unfortunately the beam "collapses", reset the page and start again