Try with GetDefaultSubobjectByName
Example:
UCameraComponent* ThirdPersonPlayerCamera = Cast(GetCharacterOwner()->GetDefaultSubobjectByName(TEXT(“FollowCamera”)));
GetDefaultSubobjectByName is a function embeded in all UObject classes and lets you get a pointer to an object whose name you know and search for in the TEXT(“objectname”) parameter…
In your case
UMeshComponent * MyMesh = Cast(GetDefaultSubobjectByName(TEXT(“Mesh”)));
hope this helps!