I've talked with the folks at Rizzini USA in Utah about doing a DT conversion. They indicated it wasn't a big deal to do. I forget the exact cost but I though it reasonable.
I've also looked at the parts list and have had my Rizzini's apart. I feel if I had the parts I could easily do it myself. They are made from the factory to be either single or DT.
Another person to talk to is Dave Moore at William Larkin & Moore. I understand they have done DT conversions in their shop when they were the Rizzini importer.
