1. Feeder Gob temperature is too low Gob is under weight Uneven gob temperature   1. Feeder Adjust gob temperature Increase weight Adjust forehearth temperature so that gob is not curling   2. Machine Setup and Operation Plunger contact time too long Parison reheat time is too short, not allowing the glass to stretch Counterblow takes places too early, not allowing the neck of the bottle to reheat enough Final blow too early Machine speed too low Bottom plate running too ht Speed of invert too fast or too slow Dirty blank and baffle   2. Machine Setup and Operation Shorten the plunger contact time Increase reheat time in blow mold Delay counter blow Delay final blow Increase the machine speed Apply cooling wind to bottom plate Adjust speed of invert Decrease blank time   3. Mold Equipment Blank size is too large Incorrect plunger design Excessive overcapacity Incorrect parison design (press and blow)   3. Mold Equipment Use a smaller size blank Correct plunger design Reduce overcapacity Correct parison design