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21-072 Bifold Door Guide Pin, National

The pin appears to be 4.25" long with a spring near the top and some kind of clip at the bottom. Th bottom diameter of the pin appears to be 5/16" . The diameter of the top of the pin appears to be about 1/4" or possibly 1/32" more but not less. (Ntt sure if it matters.) I don't see any plastic on ... (cont.)

I have a louvered metal bi-fold ( Made by National Door ) and it needs new hardware. I am attaching some pictures of the hardware in hopes that this might help. The tracks seem to be in pretty good shape.

Attached please find a PDF file with a pic of Bi-Fold Door by National Brand,a pic of both bottom pins. I need the 2 top pins (left & right complete pin assembly). I have two tracks from another metal Bi_Fold Door which may fit if I get the correct pivot bracket. Please evaluate file and se ... (cont.)

my closet has sliding doors an i need to know how to install the 81-072 pivot pin at the top.