When mounting a Zaber linear actuator, care must be taken not to over-constrain the leadscrew. At the point of contact between the leadscrew and the object to be moved there are 6 degrees of freedom which can be constrained: translation along xyz axes and rotation about those axes. The load should constrain only the axial translation of the leadscrew. The simplest way to achieve this is to have the lead screw press against a flat surface perpendicular to the axis of the leadscrew. Any further constraint (such as rigidly fixing the leadscrew to the load) may result in an over-constrained system that will reduce thrust or cause the leadscrew to bind.