Geeetech Prusa I3 X Building Instructions page 49

Shenzhen GETECH CO.,LTD
GEEETECH
X axis Fender A27
No.
2
Step 1. Thread one end of the smooth rod into the hole on the X left end.
Step 2. Continue to thread the rod into the Linear Bearing on the back of the extruder.
Note the direction, (watch the video)
Step 3. Thread the locking ring on the two rods separately and screw it up later.
Step 4. Thread the X axis Fender on the two rods separately.
Step 5. Thread the X right end to another end of the rod.
The orders should be like this.