1. Feeder Glass temperature too low Incorrect setting of shears Incorrect gob shape - too long and too small diameter Inconsistent gob drop Cords near the glass surface   1. Feeder Adjust the gob temperature Adjust setting of shears Adjust gob shape Check shear mechanism. It may be worn or plunger may be loose in the holder Check of cordy condition and correct if possible   2. Machine Setup and Operation Poor delivery - incorrect loading Settle blow on too long Blank too hot and dry Uneven blank temperature Dirty mold equipment Gob hanging up in the funnel 2. Machine Setup and Operation Use a good grade of spray oil - adjust the deflector Reduce settle blow time and/or pressure Increase cooling wind on blank and swab Apply the cooling to the two blank mold halves evenly Change blank Swab funnel and check for correct size   3. Mold Equipment Incorrect funnel design Incorrect blank design   3. Mold Equipment Check for correct funnel design and size Check the blank design