Repair : Apple MacBook MagSafe Charger Power Cord : 5 Steps (with Pictures) - Instructables
Teardown and exploration of Apple's Magsafe connector
How to Repair an Apple Magsafe Charger Magnetic End - iFixit Repair Guide
Amazon.com: Kastar New Cable "T-Tip" AC Power Adapter DC Repair Cable Cord " T " Connector Replacement for 45W 60W 85W MAC MacBook Pro Retina Pro (for Magsaf2 only) : Electronics