What the thread found

• Measure the outer diameter of the lower section of the center post using calipers to determine what monitor mount or adapter rings will fit.
• The mounting pattern connecting the topstage to the electronics is separate from how the electronics mount to the post itself.
• Monitor mount manufacturers often offer step-down rings in various sizes to adapt different diameter posts to existing equipment.
• Manufacturers can produce custom-length center posts when you specify which electronics system you are running.
• Some manufacturers offer modification services such as cutting down an existing post and reattaching the mounting hardware.

Depends on

• The standard 4-hole pattern mentioned appears to be between topstage and electronics, not between post and electronics, so compatibility may be less straightforward than initially assumed.
• Whether step-down rings will work depends on the specific inner and outer diameters of both the post and the clamping mechanism on the monitor mount.
• Custom modifications and lengths depend on manufacturer availability and willingness to perform the work.

Parts

Top Stage

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