Welcome to the forum. I'd love to able to help. You can send me a Private Message and I'll help you with posting a picture.
For vintage parts like a winding stem it might be best to have Vacheron Constantin perform the service. It can be hard for independent watchmakers to get proper parts to repair a VC watch. It might be more expensive, but at least it will be correctly done when VC does the work.
Best,
Bill