The 200x100 hinge assembly has holes for standard 100x100, 75x75 and 200x100 VESA patterns. There are also 2 additional holes in the center of the mount that can be used to offset a 100x100 VESA monitor by 50mm:
When offsetting using just the hinge assembly, place the bracket with the center and outer holes for the 200mm VESA over the monitor as below:
Use the VESA mounting screws provided with your mount to attach the monitor to the bracket. Once the hinge assembly is secured to the monitor, it will be ready for attachment to the monitor mount arms.