Jaeger-LeCoultre® 402, 427, 496, 8NR, 8RF, 8RFO Steel Back-wind Crown with Square Hole CN-LC41 Rolex® 1210 A great "how to" video

A great "how to" video included

Rathburn Ring Stretcher Ring is placed on stretcher and the gentle tapping with the mandrel causes ring to expand

This drilled stake is a replacement part for the Bergeon bushing system

Center Wheel 771 is specifically for movement 771

Jaeger-LeCoultre® 402, 427, 496, 8NR, 8RF, 8RFO Steel Back-wind Crown with Square Hole CN-LC41 Rolex® 1210 A great "how to" videoJaeger LeCoultre 402, 427, 496, 8NR, 8RF, 8RFO Steel Back wind Crown with Square Hole CN LC41 LeCoultre 402, 427, 496, 8NR, 8RF, 8RFO, steel backwind crown with square hole, diameter 7. 55 mm * Perrin Supply Ltd is independent of and not affiliated with or sponsored by Jaeger LeCoultre. Jaeger LeCoultre warranty does not apply to parts supplied by Perrin Supply Ltd. Using generic crystals may devalue your watch.