This is a standard benchmark model that shows how oscillations in pendulum swinging around point O will induce oscillations into a rectangular plate that can rotate around the axis of the pendulum.

Try running this model with the plate at an initial angle of 1° to the plane of oscillation, then simulate with an initial angle of 90°.

Reference: Kane and Levinson, "Dynamics, Theory and Applications", McGraw-Hill,1985, page 339