Geeetech Prusa I3 pro W Building Instruction page 63

Screw locking ring
Step1.Use the file to polish the holes on the X axis motor end and the idle end to
make sure the L390mm Smooth rod can thread in to them smoothly. (8 holes in
total)
Step2. Thread the L300 threaded rod to the nut of both end of X axis.
Keep both end of X axis at the same place of the rod, you are advised to measure the
distance of the both side so that they are at the same level when you put them up.
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