1. Feeder Forehearth glass temperature is uneven   1. Feeder Adjust forehearth temperature so that gob does not curl 2. Machine Setup and Operation Incorrect speed of invert Parison not hanging straight in blow mold Wear between rack and 48-tooth gear on neck ring Incorrect setting of cooling wind mold side Excessive reheat time Blank temperature is uneven Parison blown too soft One neck ring are set higher that the other Bad loading blank mold - not central Baffle with excessive oil   2. Machine Setup and Operation Invert should be cushioned so that parison does not swing when transferred to blow mold Ensure neck rings are set correctly to neck ring gauge Check 48-tooth gear on neck ring mechanism for wear. Change if necessary. Change piston and rod on invert mechanism if worn Adjust setting of cooling wind nozzle Reduce reheat time Adjust settings of blank mold cooling Increase counter blow pressure and/or time Check neck ring setting Adjust deflector to give central gob loading Raise or lower trough Check for dirty blank and baffle   3. Mold Equipment Blank design too short Neck of blow mold smaller than blank, causing bad transfer   3. Mold Equipment Check blank design and decrease run-down Check dimension of blank mold neck and blow opening