You need to change the value for bodyCylinder.r[3] (in "oscillant") to {0,0,0} and the same change for bodyBox (in "support").
Both these components will otherwise use their start values, which are {0.1,0,0}. You can see this by opening Modelica.Mechanics.MultiBody.Parts.BodyCylinder in the Modelica Text View in SystemModeler.
