Look for a micro-welding expert and not a gunsmith. They often advertise themselves as tool and die makers or machinists in the US. Many gunsmiths cannot weld anything and send their work out. You can fit the hand yourself, it is not difficult. Have someone build up the top of the hand and you can file to shape. Make sure to tell the welder the age of the part, so they know it is low carbon content steel. Take a picture of the hand before having it worked on and take several dimensions. Match the welded hand's proper shape with it longer than original to try. Keep taking off a very small amount of metal and try until you get the cylinder to lock up solid.

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Gary
SWCA 2515