Pin Cap for Ternes steel bifold doors

Thanks for reaching out to us. We're happy to look into this. Can you measure and write out the diameter of the pin shaft where this cap goes? 

I believe you have the old style Slimfold door. Those caps are no longer available, unfortunately, but we do carry the new style Slimfold pins that will fit in your door. The pin you are showing is a bottom guide pin. You will need to remove the door, unscrew the rod clamp, remove the pin, and install the 21-007 spring loaded pin. See our media guide on this page for more information. There's no need for the rod clamp, but save it for the bottom threaded pin, the 21-001, when you need to replace it.