another question......about hollow bulbs....I know that he spoke of using a hollow bulbed obturator, but I do not think that this one has a hollow bulb. We did decide that we did not want to use one without a top on the bulb, but I thought that the bulb could be hollow and still be covered and sealed. Is this so?

This is my "definitive" obturator, made of metal and acrylic, and costing plenty ($2500) so I expect it to be a significant improvement over what I have had in the past. We haven't gotten what I consider to be a good fit yet, but it does not feel as lightweight as I had expected. I will ask him about that.