Prentke Romich Company
http://www.prentrom.com/support/article/1571
The Wheelchair Mounting Plate and four screws came in the box with your device. With the mounting plate in place you can mount your device on a table stand or a wheelchair mount.
Note: The wire stand may need to be removed in order to attach your quick release mount.
Place your device face down on a soft towel on a flat surface, to prevent scratching your display.

The mounting plate screws into the four small holes outlined in white, above.
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Place the mounting plate over the small holes on your device. (Your mounting plate will be black.)
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Place the screws through the mounting plate and device holes and tighten the screws.
NOTE: This mounting plate is compatible with the QRM-2, TS-XL, and Desktop Mount. However, you cannot use the PRC5 and TUSB with this mounting plate.