1. Feeder Glass too hot Uneven glass temperature Incorrect gob shape - usually too long   1. Feeder Adjust the feeder temperature Adjust forehearth temperature until the gob does not curl Adjust the gob shape   2. Machine Setup and Operation Gob not loading correctly Uneven mold cooling wind setting Dirty mold equipment Parison too soft Counterblow time or pressure insufficient Final blow too late Blank contact time too short Parison reheat time too long Scoop returning too early Too long settle blow time - bad settle wave   2. Machine Setup and Operation Adjust deflector for correct delivery Reset mold cooling wind correctly Change all dirty mold equipment Increase counterblow time or pressure Advance the final blow Increase the blank contact time Reduce parison reheat time -this also reduces parison stretch Check and adjust the scoop timing and cushioning Reduce settle blow time and advance timing if possible Check settle blow air pressure at machine   3. Mold Equipment Shoulder of blank mold too small (high shouldered blanks)   3. Mold Equipment Increase diameter of blank mold shoulder