Louis C Springfield , VA July 11, 2016 Appliance: General Electric Refrigerator TPH21PRSAAA Ge Refrigerator Tph21prsaaa: Failed refrigerator lower door hinge. How to replace Riser Cam Shim. Replaced with new lower door hinge kit. Inadvertently did hot replace lower cam shim, though I likely should have. Online serve videos were invaluable. Do-It-Yourself Rating: Repair Time Estimate: 30-60 minutes