Rattle-less steps

The spiral steps have been rattling as we climb up and down.  I located the source of the rattling:  one of the banisters near the top had lost its plastic bushing, so whenever the step shook the metal banister rattled against the metal step it was inserted into (top photo).

I took off the banister, wrapped the end with a strip of duct tape (middle photo), and reinstalled it (bottom photo);  no rattles.