Step1. Put the locking ring on the two smooth rods separately.
Step2. Add the Z top mount (No.A8) to the top of A1. Slowly rotate the rods into the
holes, or add some lubricants on the rods. Do not force it, or u will break the acrylic
piece.
Step3. Screw it up with M3 x 16mm screw and M3 Square nut.
Step4. Screw up the locking ring on smooth rods.