1. Feeder Glass too cold Gob improperly shaped - usually too blunt or insufficiently pointed - mainly at the tip, and too thin at the shear end Plunger not pulling the glass into the orifice - insufficient reheat of the tip of the gob    1. Feeder Adjust gob temperature Adjust gob shape Change the plunger cam and adjust the differential   2. Machine Setup and Operation Delivery equipment incorrect - mainly the deflector Delivery equipment not properly lubricated Dirty delivery equipment - reducing speed of the gob Too much wind cooling on blank Incorrect swabbing   2. Machine Setup and Operation Use correct size delivery equipment Lubrication with a good grade of spray oil Clean delivery equipment Reduce cooling wind on blank Swab correctly with a clean dry swab and correct swabbing compound   3. Mold Equipment Blank size too large - blank remains too cold Blank improperly shaped - loading condition was not considered Funnel too small or too large 3. Mold Equipment Use a smaller size blank Alter the banks shape to give easier loading Check for correct size of funnel