Erik Kostson
Ansys Employee

As we can see the left boundary condition (C in the image below) is not working, as that lug moves in the z direction so downwards.

So on one of the remote displacements (C in the image below) on this left lug is wrongly scoped. Make sure that remote displacement (C below) is scoped to the inside face of this left lug (lug that moves down), just as marked below.
Also for the point mass, scope as direct attachment, and to a node or introduce a vertex and scope it to that point/vertex.

Thank you