  The Cherenkov Telescope Array (CTA) will be the future observatory for TeV
gamma-ray astronomy. In order to increase the sensitivity and to extend the
energy coverage beyond the capabilities of current facilities, its design
concept features telescopes of three different size classes. Based on the
experience from H.E.S.S. phase II, the Institute for Astronomy and Astrophysics
T\"ubingen (IAAT) develops actuators for the mirror control system of the CTA
Medium Size Telescopes (MSTs). The goals of this effort are durability, high
precision, and mechanical stability under all environmental conditions. Up to
now, several revisions were developed and the corresponding prototypes were
extensively tested. In this contribution our latest design revision proposed
for the CTA MSTs are presented.
