Standard Manipulator ArmsReplacement or Add On Manipulator Arms for your Existing Stereotaxic Features The manipulator arm controls medio lateral and vertical positioning via lead screws, and antero posterior movement via dovetail slide movement, with 80 mm of travel possible in each direction. A Universal Joint allows the investigator to change the angle of the probe up to 90o in either the antero posterior or medio lateral planes. The locking mechanism on tarm will hold any