1. Machine Setup and Operation Neck ring arms set too high over the mold Parison swings too much on invert Mold closes too soon Worn or poorly aligned mold linkage Badly made take-out tongs Glass in blow head Bent blow tube Vacuum not coming on Tab broken on invert arm lock   1. Machine Setup and Operation Use neck ring setting gauge Adjust cushioning of transfer action Delay mold closing action Change mold close linkage and align with mold and blank linkage aligning fixture Check take-out tongs and realign   2. Mold Equipment Diameter of parison neck larger than diameter of blow mold neck Incorrect transfer clearance in mold design Blank mold worn at the joints Take-out tongs too small   2. Mold Equipment Check parison neck is smaller than mold neck Check correct transfer clearance (mold design) Change blank mold and have worn blank repaired or replaced Check take-out tongs and fit correct size