I think the stick may not be the best device for people with arthritic hands. The insertion of the KBC (801) atomizers leaves a small space to grasp the atomizer. Using a cart (I've had no problems with the rubber tips or Janty carts) on the KBC (801) is the best way to screw and unscrew the atomizer. As far as the adapter goes, it is basically the same "housing" as a KBC (801) atomizer, and the 901 atomizer fits inside leaving no part of the atomizer extending out of the adapter. This is what requires a tight fitting 901 cart (which most 901 carts are) and is why I suggest not to use the Dura cart.
If you experience problems with screwing and unscrewing atomizers now, the stick will not help in that regard and will in fact be more difficult. Too difficult for the average person no, Too difficult for arthritic hands, probably.