Spindle
A glide needs to be specific to your particular wand. Borrowing someone elses glide, who might have a different wand is a complete waste of time.
If you are cleaning one carpet a day, then fine, you probably don't need a glide. If you clean carpets 9- 5, 5/6 days a week, then not only will a glide lengthen your professional life but your clients will also benefit from reduced drying times