Desk Mount Beam Assembly Accessory slide them to the desired

slide them to the desired height on the vertical beam

One of these  comes by default with any Desk Mount order

and can then use the slots

or large round-overs

Note: The last two photos show an example of the Variable Angle Bracket installed with a Desk Mount Beam Assembly

Desk Mount Beam Assembly Accessory slide them to the desiredThis product is the Beam Assembly portion of the Foxx Mount Desk Mounts. Combine this with a Mounting Plate for a complete Desk Mount. Note, this is just the beam assembly, not a full desk mount, so you cannot use this on it's own to secure a stick or throttle. A Mounting Plate is required as an additional purchase to secure a stick or throttle. A Desk Mount Beam Assembly includes the following: Vertical Assembly [Vertical Beam, Top Plate, Toggle