1. Feeder Glass too cold Bad shear mark Gob too pointed   1. Feeder Adjust the gob temperature Change shears Adjust gob shape   2. Machine Setup and Operation Neck ring set too low; rubbing on the top of the mold causing the ring to be lifted in the neck ring arm Neck ring arms not set at the same height causing a strain when the bland opens Neck ring arm not square Too much settle blow, pressure and/or time of application Neck ring or plunger too cold Improper invert mechanism end of stroke cushioning Too much cooling wind from finish cooling nozzle, mainly on press and blow Too much oil and water running down from deflector into the neck ring Too much oil spray Neck ring not releasing properly (too dry or opening too fast or too slow) Incorrect height adjustment of plunger mechanism Baffle down too hard causing additional deflection of mold holder Interlock between blank and ring dirty, causing neck to open when blank opens Too long vacuum time, resulting in cooling the finish mold equipment   2. Machine Setup and Operation Set neck ring arms to neck ring setting gauge Check invert mechanism with neck ring mechanism aligning fixture Change the neck ring arms Reduce settle blow time and/or pressure Reduce plunger cooling time and/or pressure Check cushioning of invert mechanism Reduce cooling wind Fit drip pan to deflector Reduce oil spray Adjust neck ring opening Adjust height of plunger mechanism Adjust the speed of baffle mechanism Change blank mold Reduce the vacuum time   3. Mold Equipment Neck ring radius too sharp, thread not relieved Neck ring cavity not polished Improper fitting between blank and ring No relief at blank and neck ring match Neck ring size too large   3. Mold Equipment Relieve threads in neck ring Polish neck ring cavity Check against mold gauges Proper relief of blank and neck ring Use a smaller neck ring mold