This bushing fits the pivot point of the chopper blade assembly on a straw chopper. It provides a replaceable wear surface between the blade and its mounting pin, maintaining the correct clearance for free rotation. As the bushing wears, the blade develops excessive play, which leads to vibration and uneven cutting. Replacing the bushing restores the original fit and eliminates the need to replace the more expensive blade or its carrier. On installation, ensure the bushing is fully seated and the pin is lubricated before assembly.