The Vision Engineering MTB200 VERSO Arm is for use with the Mantis Stereo Microscope Systems. The VERSO arm can be mounted to a work-surface using either the included bench clamp or by screwing directly onto a surface of sufficient strength. If using the bench clamp, connect to the base mount using the 4 fixings provided. If mounting directly onto the work surface, use four M5 bolts and nuts (not provided) through the outer 4 holes of the base mount. The VERSO arm should rotate easily when located properly. Adjust the VERSO arm counterbalance depending on the weight of the head and objectives mounted on it. Remove the cable tidy cover to expose the thumbwheel adjuster to adjust the control until the arm until it balances unaided when placed in the middle of its travel. Rotate the thumbwheel to the left (towards +) to increase the counterbalance for heavier loads (PIXO/ERGO). Rotate the thumbwheel to the right (towards -) to decrease the counterbalance for lighter loads (IOTA). Use the Friction Brake handle on the right hand side of the VERSO Arm to apply friction and/or lock the vertical movement of the arm in place. Cable tidies on the VERSO Arm can be detached in order to route any cables down the arm.