Dual Arm Monitor Stand for LCD/LED Displays RHMS-11002 User Manual
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B : Through-Desk 1"(25.4mm)diameter<=2.95"(75mm)
You need disassemble the base[02] assembly at first ,then assembling again according to the
following pic
C: Grommet Hole 2.95"(75mm)<=hole diameter<=3.9"(100mm)