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Step 6d Carefully slide the Stepper Motor Shaft
into the Helical Coupler. Then fit the
tabs of the Carriage Frame Assembly
into the slots in the Z Stepper Motor
Mount and secure with four M4 x 16
Machine Screws and Nuts.
Step 6e Carefully tighten both set screws on the
Helical Coupler against the Stepper
Motor shaft.