His trademark black mock-turtleneck was drooping from a fleshless frame, and his neck and cheeks were hollow.

Crack in neck of hollow shaft is a very serious malfunction, main cause of the crack include: foundry defect, centralized stress, quality problems of welding and heat treatment.

The result shows that if only we do strictly according to the welding technics requirements and adopt reasonable welding method, crack in neck of hollow shaft can be repaired well.