Put the electric treadmill flat on the ground.
Make the treadmill run at a speed of about 6-8km/hour.
If the running belt leans to the right, rotate the adjusting bolt to the right half a turn clockwise, then rotate the left adjusting bolt half a turn counter clockwise. (Picture A) .
If the running belt leans to the left, rotate the left adjusting bolt half a turn clockwise, then rotate the right adjusting bolt half a turn counter clockwise. (Picture B).
Picture (A)
Picture (B)