As Tbones said and the only way to repair is to replace with a new one it comes as part of the carb slide be careful when fitting that the ridge on the edge of the diaphragm sits correctly in its recess when the carb top is fitted
As Tbones said and the only way to repair is to replace with a new one it comes as part of the carb slide be careful when fitting that the ridge on the edge of the diaphragm sits correctly in its recess when the carb top is fitted