  The Cherenkov Telescope Array (CTA) is a future ground-based observatory for
gamma-ray astronomy providing unparalleled sensitivity in the energy range from
20 GeV up to 300 TeV. CTA will consist of telescopes with three different
sizes. The Medium-Sized Telescopes (MSTs) will have 12 m reflectors with a
tessellated mirror design of 86 mirror facets each. Each mirror facet is
mounted on the mirror support structure with two actuators that are adjustable
in length to align the mirrors, and a freely rotating fixpoint. Image
resolution and pointing accuracy constraints impose limits on the backlash and
deformation of the actuators and the fixpoint under various weight and wind
loads. In this contribution, the test stand to measure the backlash and
deformation behaviour of actuators and fixpoints is described and the
measurement procedure is explained.
