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Step 4 Installing the Acme Screw.
Step 4a Thread the Acme Rod Assembly through
the hole located at the front of the
Carriage Top Support (QY2) and into the
Acme Nut. Rotate the Acme Screw
through the Acme Nut until the bearing
touches the Carriage Top Support. Then
turn Acme Screw just until Z Carriage
begins to rise up the Rail.