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Step 4 Installing the Acme Screw.
Step 4a Thread the Acme Screw Assembly
through the hole located at the front of
the Carriage Top Support (QY2) and into
the Acme Nut. Rotate the Acme Screw
Assembly 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.