Use bushings to create connectors or constraints with specific degrees of
freedom.
Select bushing type.
Bushings connect two parts together. Grounded bushings connect a
single part to a fixed point.
Set stiffness values to either 0 (free) or Rigid.
Note: The directions in the Stiffness tab
reference the local coordinates for each bushing, not the global
coordinate system. You can change the global coordinate system in
the Coordinate system tab.