The provided manual describes the "MAST DYNAMIC ARM - BOLT THRU MOUNT," a versatile accessory designed to enhance ergonomic workstations. This device allows users to mount computer monitors, offering flexibility in positioning and reducing strain. The manual covers two main models: the "Mast Dynamic Arm with Bolt Thru Mount (YMSTD)" and the "Mast Dynamic Arm Light with Bolt Thru Mount (YMSTX)," catering to different monitor weight requirements.

Function Description:

The Mast Dynamic Arm is essentially a monitor mounting system that attaches to a workstation via a bolt-thru mount. Its primary function is to hold a computer monitor securely while allowing for dynamic adjustments in position. This includes rotation, stiffness adjustment, and counterbalance load adjustment, enabling users to customize the monitor's placement for optimal viewing comfort and ergonomic posture. The system can support either a single monitor (using the Single Arm Stanchion) or two monitors (using the Dual Arm Stanchion, an optional component).

Important Technical Specifications:

Mounting Type: Bolt Thru Mount (D06-4176). This involves drilling a 1/2" (12.7mm) diameter hole in the worksurface. The hole must be at least 3" from the back edge of the worksurface to its center.
Dynamic Arm Models and Weight Capacities:
- Dynamic Arm (N09-5874): Supports monitors weighing from 8 to 30 lbs.
- Dynamic Arm Light: Supports monitors weighing from 2 to 13 lbs.
VESA Plate: The system uses a Mast VESA Plate (N09-5826) to attach to the monitor.
Fasteners for Bolt Thru Mount:
- M12 Fender Washer (MST-107) x1
- M12x1.75 SHCS 90mm Bolt (MST-164) x1 (for standard installation)
- M12x1.75 SHCS 80mm Bolt (MST-165) x1 (optional)
VESA Plate Mounting Kit (Optional, must be ordered separately):
- Black Spacer (E03-0806) x4
- M4x16mm Pan Head Machine Screw (E01-0999) x4
- M4x10mm Pan Head Machine Screw (E01-1096) x4
Stanchion Options:
- Single Arm Stanchion (N09-5875) x1
- Dual Arm Stanchion (N09-5876) x1 (optional)

Usage Features:

Easy Installation: The installation process is broken down into clear steps, starting with drilling a hole in the worksurface, assembling the base, mounting the stanchion, and finally attaching the dynamic arm and VESA plate.
VESA Plate Assembly: The VESA plate screws directly to the back of the computer monitor. For monitors with recessed inserts, longer screws and spacers (ordered separately) can be used. The VESA plate then slides onto the dynamic arm and clicks into a secure hole.
Arm Rotation Adjustment: Users can adjust the angle of arm rotation from 360° to 180° by rotating a set screw on the back of the Stanchion Hub.
Arm Stiffness Adjustment: The same set screw on the Stanchion Hub also allows for adjusting the stiffness of the arm's rotation.
Counterbalance Load Adjustment: This crucial feature allows users to adjust the spring-loaded counterbalance to match the monitor's weight. Rotating an Allen key to the "+" direction increases support for heavier monitors, while rotating it to the "-" direction is for lighter monitors. The adjustment should continue until the arm stabilizes at a desired position.
Cable Management: The system incorporates cable management features, including an Arm Wire Clip located under the Dynamic Arm and a Cable Management Clip. Cables are inserted into these clips and then led into a Stanchion Clip at the back of the Stanchion, keeping the workspace tidy.
Monitor Removal Procedure: The manual provides a detailed, multi-step process for safely removing the monitor. This involves extending the arm to its highest position, unplugging all cables, loosening a quick release override set screw, and then holding the monitor with one hand while depressing a "Library Green" safety latch with the other to disengage and lift the monitor off the arm.

Maintenance Features:

Adjustability for Longevity: The ability to adjust arm stiffness and counterbalance load ensures the arm can be reconfigured for different monitors within its weight range, extending its useful life.
Clear Removal Instructions: The detailed monitor removal instructions facilitate safe and easy detachment for maintenance, replacement, or relocation of the monitor without damaging the arm or the monitor itself.
Cable Management for Organization: Effective cable management not only keeps the workspace neat but also protects cables from damage, contributing to the overall longevity and reliability of the setup.
Note on Dynamic Arm Charge: An important maintenance note is that the Dynamic Arm remains charged independently of the monitor, meaning it will not push down or lose its set position when the monitor is removed, provided the quick release override set screw is not tightened. This prevents unexpected movement and potential damage during monitor changes.

Teknion YMSTR - Mount Dynamic Arm to Stanchion; VESA Plate to Monitor Attachment