How does this modification change the weight of the assembly?

On the 27" Cinema display (A1316) how much does this modification affect the weight of the assembly. It starts at 23.5 lbs. Making this mod means removing the pedestal and adding the adaptor plate. When looking at the load rating of swing arm mounts it might make a difference.

VESA Mount Adapter Kit for iMac and LED Cinema or Apple Thunderbolt Display

VESA Mount Adapter Kit for iMac and LED Cinema or Apple Thunderbolt Display

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