Have you damaged your plastic plunger? The plastic plunger was designed to push produce down the feeding chute without touching the twin gears.
White Plastic Plunger compatible with all Greenstar® Juicers:
• Greenstar® Pro (GS-P501 - White)
• Greenstar® Elite (GSE-5000 - White)
• Greenstar® Gold (GP-E1503)
• Green Power Gold (GP-E1503)
• Greenstar® Original (GS-1000 / GS-2000 / GS-3000)