Product reviews for Evolution Walker Replacement & Adjustment Knobs

I thought that this was a nut and bolt set (meaning that the knob (nut) can be separated from the bolt. Unfortunately, it is simply a bolt with a plastic knob that cannot be separated from the bolt and therefore doesn’t work on the Xpresso walker as there a separating nut/bolt assembly is required in order to adjust the arm height. I am working with the seller now to return these knobs.