1. Feeder Glass too cold Incorrect gob shape Bad shear cut   1. Feeder Adjust the feeder temperature Correct the gob shape Reset the shears   2. Machine Setup and Operation Incorrect parison transfer Plunger cylinder incorrectly set Excessive settle blow time Bad loading-poor deflector adjustment Dirty blank 2. Machine Setup and Operation Check neck ring setting Check plunger cylinder setting Reduce the settle blow time Reset deflectors and check the gob loading   3. Mold Equipment Incorrect blank mold and neck ring match Offset blank mold holder   3. Mold Equipment Check with mold gauges Change the blank mold holder