1. Feeder Glass too hot   1. Feeder Adjust the feeder temperature   2. Machine Setup and Operation Speed of invert too great Insufficient parison stretch in blow mold before final blow Neck ring opening too quickly and too wide at transfer Parison not hanging straight in blow mold Parison too soft One neck ring arm set higher than the other   2. Machine Setup and Operation Correct speed of invert and final cushioning Delay time of final blow or advance invert Adjust neck ring opening for speed and distance Check parison transferring cleanly into the blow mold Increase counter blow time and/or pressure Increase blank mold contact time and/or blank cooling wind Correct neck ring setting   3. Mold Equipment Neck of parison diameter too large for blow mold neck diameter Baffle running too hot   3. Mold Equipment Check design of parison neck diameter and blow mold neck diameter Check thickness of the baffle