Product Overview
This spring is used to adjust the height of the Lower Crutch Assembly. Easily replace them by sliding the tube that is attached to the foot all the way out, then use needle nose pliers to squeeze the push button springs together and insert them into the tube.
(https://store.iwalk-free.com/Standard-Equipment-Replacement-Part--Push-Button-Spring-Double-head-foot_p_36.html)
