1.Remove the braket that holds the rest, it's easier to remove the pivot.
2.Loose the nut.
Step 1: Worn Out Pivot
I Applied heavy grease around the worn out pivot.
The pivot is worn about 0.2mm so I used a 0.1mm metal sheet to wrap the pivot, and after that applied more heavy grease.
Assemble all the parts and do not forget to go around the block to test if everything is right.