I have a question for you hollow form turners. I see so many with the top opening with different woods. I haven't really tried that and generally make single wood hollow forms. What method do you guys use to add the different woods and do you turn with a wide opening and then add the different woods or turn with the contrasting woods at the same time. How do you glue the piece on? I'm sure I could experiment and find a good method, but asking you guys that do it frequently for a best method.