Paul,
I printed out a copy of the Moss guide on properly mounting wire wheels for balancing and took it with me to the local tire shop, explained the how and why and they pulled the correct adapters from the warehouse to make it work. This was my first experience getting wire wheels balanced and they did a beautiful job, rotating the tire on the wheel to the point of needing very little weight. This was their first time mounting and balancing wire wheels and they obviously care about their work.
Rut