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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LX Monitor Arm Extension – Add-on for LX Desk and LX Wall Monitor Arms, LX Keyboard Arm – White

Product ID: 442334283

📏9-inch extension for extra reach

🔄Additional pivot point for max adjustability

🛡️10-year warranty for lasting durability

627.44 DT

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Sold byAmazon TunisiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

📈 Elevate your workspace reach — because your desk deserves the upgrade!

BUILT TO ENDURE - Backed by Ergotron’s 10-year warranty and rigorous quality testing for peace of mind.
SLEEK STREAMLINED - Clean cable management keeps your desk clutter-free and visually stunning.
EXTEND YOUR WORKSPACE - Add 9 inches of flexible reach to your existing LX Arm for ultimate ergonomic freedom.
SEAMLESS COMPATIBILITY - Effortlessly upgrade your LX Desk, Wall, or Keyboard Arm with a quick, tool-free installation.
TAILORED ADJUSTABILITY - Extra pivot point means personalized positioning for every work style and body type.

The Ergotron LX Monitor Arm Extension adds 9 inches of adjustable reach to compatible LX Desk, Wall, or Keyboard Arms, enhancing ergonomic flexibility and workspace organization. Designed for easy installation and clean cable management, it supports a reduced load capacity of up to 17.6 lbs and comes with a 10-year warranty, ensuring durable, high-quality performance for professional environments.

Specifications

Asin	B09HTZVK4F
Best Sellers Rank	#984 in Computer Monitor Arms
Brand	Ergotron
Color	White
Customer Reviews	4.6 4.6 out of 5 stars (949) 4.6 out of 5 stars
Date First Available	February 23, 2022
Item Dimensions Lxwxh	13.25 x 4.75 x 2.5 inches
Item Model Number	45-289-216
Item Weight	7.2 ounces
Manufacturer	Ergotron
Product Dimensions	13.25 x 4.75 x 2.5 inches

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