Nexus 21 XL-75s Installation Instructions Manual page 14

Step 19: Separate the Swivel Mechanism from the Swivel Adapter Plate and attach the Swivel Adapter Plate to the top of
the Center Lift Column using (4) 6 x 12 BHMS Screws.
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Step 20: Re-Attach the Swivel Mechanism to the Swivel Adapter Plate and fasten them together by tightening the screws
in the unthreaded holes on the top of the Swivel.
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