Could this be clamped on a bar above my work space and used in a sort of upside down manner? There is no nearby wall or desk.

It has to be in it's upright position. The way it's build weight (from above) keeps it in place. If you try to mount it upside down it won't work.

What diameter does the pole/pipe/mount need to be to fit or work with this extension arm?

For this arm it is 1.38" (35mm). It is not compatible with the LX HD mount which has a 1.57" (40mm) pole

Will this work with the LX Dual Stacking Arm in order to have a longer arm at the top height?

The top arm is of fixed length and is non adjustable except for up-down tension. The extension allows the unit to expand the length from the wall bracket to the device. The device is raised in height by the height of the extension somewhere round six inches. Only two extensions can be used (raising height 12 inches aprox) and bracket on wall can be mounted lower or higher to set the device to be at the desired level. Excellent quality and durable product, mine is used with a laptop that folds away on the wall when not in use.

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🚀 Elevate your workspace reach and style—because your desk deserves the best!

BUILT TO ENDURE - Backed by Ergotron’s 10-year warranty and rigorous quality testing for rock-solid stability.
EFFORTLESS SETUP - Quickly upgrade your monitor or keyboard arm with a hassle-free installation—no extra tools needed.
CLUTTER FREE ZONE - Integrated cable management keeps your desk clean and professional, boosting focus and style.
TAILORED ERGONOMICS - Extra pivot point delivers personalized positioning, perfect for diverse work styles and setups.
EXTEND YOUR WORKSPACE - Add 9 inches of sleek, polished aluminum reach to your existing LX Arm for ultimate desk freedom.

The Ergotron LX Monitor Arm Extension is a polished aluminum add-on that extends the reach of compatible LX Desk, Wall, or Keyboard Arms by 9 inches. Designed for easy installation and enhanced adjustability, it features integrated cable management and is backed by a 10-year warranty, ensuring a durable, ergonomic upgrade to any professional workspace.

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Standing screen display size	1 Inches
Brand	Ergotron
Series	ERGOTRON INC.
Item model number	45-289-026
Operating System	not_machine_specific
Item Weight	1 pounds
Product Dimensions	13.25 x 4.75 x 2.5 inches
Item Dimensions LxWxH	13.25 x 4.75 x 2.5 inches
Color	Polished Aluminum
Number of Processors	1
Voltage	240 Volts
Manufacturer	Ergotron
Language	English, English, English, English
ASIN	B006PYHYXG
Is Discontinued By Manufacturer	No
Date First Available	September 11, 2018

Ergotron – LX Monitor Arm Extension – Add-on for LX Desk and LX Wall Monitor Arms, LX Keyboard Arm – Polished Aluminum

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