Adam, it sounds like your Grandmothers Tradition had a soft blue plastic covering over the safety switch , which was originally designed to keep moisture out when the Rug Renovator was used, actually that was the reason for the speed switch up in the headlight, to keep moisture from dripping into the speed switch, however, the blue rubbery coating on the safety switch proved disastrous as it often made the speed switch get stuck in the higher speed causing premature carbon brush failure, premature belt wear and of course caused the machine to be tough to push. The Tradition had many versions, a lot of trial and error with everything from the Kirby Kaddy for the attachments, to the speed switch, the choice of shake out and disposable bags, it was probably my most least favorite Kirby every built, with the exception for the color. We had a gold colored Tradition in my office for some time to keep on display, I don't remember what happened to it.