pin for top of metal bifold closet door

A home owner from Chicago says:
This is a picture of the pin on the top of my metal bifold closet door.
Thumbnail of the uploaded file named IMG_0747.JPG
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Paul from SWISCO responded:

Can we have you give us some measurements of the part? We need the diameter of both where it goes in the door and then the skinnier tip that it goes on. It seems as though you may have a Float-A-Way bi-fold door. Is there any chance you're looking  for the pin assembly or nylon cap like the 21-104? Take a look and let us know. 

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