Hi jfalberti.
I looked on eBay and saw that, but if you scroll down a bit, you'll see one designed to fit models 517 to Legend. It's a bit pricy, but also comes with test pads, so I can practice at home prior to the convention. And yes, I'm quite aware that there may not be time for me to do a public demo. Barb may have other things lined up, or somebody from Kirby to show us other models. Frankly, this will not bother me, but I do want to be prepared if the opportunity should come up. If all else fails, I'll do it at home later this year and put it on Youtube.
Thanks for your suggestion,
Alex Taber.