1, lift it out of the window and remove the whole window.
2. Unscrew the screws for fixing pulleys on both sides of the frame with a screwdriver.
3. Tap gently around the frame with the back end of the screwdriver, and then easily remove the frame after tapping lightly.
4. After the pulley frame is removed, the pulley can be taken out directly.
5, choose the appropriate standard pulley installation, replacement is completed.