1/4 in W nylon wheel on spring-loaded steel shaft with plastic housing that tapers to 3/8 in OD to allow for hammering into drilled hole. Self-adjusts from 1-1/2 to 2 in H.
Plastic wheel on spring-loaded steel shaft
Plastic wheel on spring-loaded steel shaft
Self-adjusting for smooth guidance of lead door
Use hammer to lightly tap into drilled top-mount hole