Nexus 21 E-550 - Page 17

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Step 9: Press the Shoulder Bolts on the Projector Mount into the keyed holes of the Crossmember, then slide it forward to lock it into place.
Important Note: Slowly let go of the Projector to make sure it is secured within the keyed holes. Once the Projector Mount is in place, do not bump or move
it until the next step is complete.