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Step 2 Building the Gantry Back Assembly.
IMPORTANT: The two smaller rectangular cutouts in the
Gantry Frame (QG1M) indicate the top of the Gantry Frame.
Step 2a Attach the five Y Rail Supports (QG4) to the
Gantry Frame (QG1M) and secure each with
two M4 X 16 Machine Screws and Nuts as
shown.