1. Feeder Glass too hot Gob weight too low 1. Feeder Reduce glass temperature Check and correct for Gob Weight 2 Machine Set-up Gob loading too low Machine speed too high Insufficient Neck ring coolin 2. Machine Set-up Increase length of plunger spacer, decrease length of stop screw Reduce machine speed Increase Neck ring cooling 3. Mould Equipment Neck ring too small · Blank mould overcapacity 3. Mould Equipment Make finish in larger neck ring