A header for an agricultural harvester for harvesting crop material from a field, the header comprising: a feedback assembly for detecting the quality of operation of one or more blade assemblies of a cutterbar of the agricultural harvester during operation of the agricultural harvester, the feedback assembly comprising: a chassis connectable to a frame of the agricultural harvester; one or more rods coupled to the chassis; and, one or more tines rotatably coupled to the one or more rods and configured to rotate about the one or more rods between a non-actuated position and an actuated position when the one or more tines come into contact with the crop material as the agricultural harvester moves across the field, each of the one or more tines defining an elongated body comprising a linear section extending from the one or more rods, and an angled section extending at an angle from the linear section characterised in that the feedback assembly comprises one or more sensors coupled to at least one of the chassis and the one or more rods, the one or more sensors configured to detect a rotational position of the one or more tines relative to the one or more rods, and wherein the one or more sensors are configured to electronically transmit the detected rotational position of the one or more tines to a controller adapted to adjust the operation of the one or more blade assembly. a feedback assembly for detecting the quality of operation of one or more blade assemblies of a cutterbar of the agricultural harvester during operation of the agricultural harvester, the feedback assembly comprising: a chassis connectable to a frame of the agricultural harvester; one or more rods coupled to the chassis; and, one or more tines rotatably coupled to the one or more rods and configured to rotate about the one or more rods between a non-actuated position and an actuated position when the one or more tines come into contact with the crop material as the agricultural harvester moves across the field, each of the one or more tines defining an elongated body comprising a linear section extending from the one or more rods, and an angled section extending at an angle from the linear section characterised in that a chassis connectable to a frame of the agricultural harvester; one or more rods coupled to the chassis; and, one or more tines rotatably coupled to the one or more rods and configured to rotate about the one or more rods between a non-actuated position and an actuated position when the one or more tines come into contact with the crop material as the agricultural harvester moves across the field, each of the one or more tines defining an elongated body comprising a linear section extending from the one or more rods, and an angled section extending at an angle from the linear section characterised in that the feedback assembly comprises one or more sensors coupled to at least one of the chassis and the one or more rods, the one or more sensors configured to detect a rotational position of the one or more tines relative to the one or more rods, and wherein the one or more sensors are configured to electronically transmit the detected rotational position of the one or more tines to a controller adapted to adjust the operation of the one or more blade assembly.