Fixing the broken IR glass on Canon flash 550EX.

Recently I broke the small red protection window on my Canon 550EX flash. This plastic part protects the light emitter used by the autofocus assist system to project a red light pattern in the middle of the image to ease autofocusing in dim environments. The optics used to produce this vertical and horizontal pattern is clearly visible in this image with the spare part nearby. It was extremely easy to snap the new part in place after the unit was carefully cleaned from small plastic parts after the small accident.