Please follow this installation method:
Step 1: Align the left tube with your desired height holes on the main unit, insert the pin and press it lightly without twisting to lock.
Step 2: Fit the right tube in the same way, insert and lightly press the second pin, still leaving it unlocked.
Step 3: Hold both pins pressed down together, then twist each pin 90 degrees at the same time to fasten them tightly.
Step 4: Twisting both pins simultaneously keeps the tubes perfectly aligned for easier assembly and stops loosening caused by unit vibration.
You can also watch this Video:
If you fully lock one pin before installing the other tube, the pipes will easily shift out of alignment. This will make assembly harder and leave the pins poorly secured, which may come loose or fall off as the machine vibrates during use.