Paul from SWISCO responded:
October 31, 2016
Thanks for posting. I have received your pictures, but I cannot clearly make out your hardware. I am assuming the door accepts 1/4" thick pins, but I'm not sure. If I'm right, I would suggest new complete tracks for both the top and bottom, like our 21-404. With that, you will also need one 21-002 bottom threaded pivot pin and three 21-044 guide pins per door. The tracks come with pivot brackets, but you will also need rubber bumpers, our 21-277. What do you think?
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Dave Sr. from SWISCO responded:
November 2, 2016
Metal bifold doors like yours would not take a heavier spring than normal. The pressure is on the bottom and top threaded pivot pins. The guide pins just keep the door in the track. I would install both top and bottom tracks to keep the door operating properly. As for the nylon grommets, it appears from your prior photos you should use two for each guide pin.
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