A home owner from Kentucky says:
The line that move in the track have no springs. I have tried tightening the screw below it but the pin keeps popping out of the track. Will replacement hardware keep the doors from popping out? Any help
Is greatly appreciated
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Bob from SWISCO responded:

Thanks for posting. I think we should be able to help, but I need the diameter of those pins as well as the diameter of any caps atop the pins. If there's a sticker that shows the brand or manufacturing information, that also would be most helpful. Many thanks. You can read more about repairing Bifold Doors here.

A home owner from Kentucky says:
The cap on the pin is approximately a .370 diameter. The pin itself is approximately a .308-.310. I could not locate a model number or a manufacturer.
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Paul from SWISCO responded:

Looks like you have the old model of the Slimfold bi-fold door. They have made a simple improvement to help keep the doors on the track. Your bottom threaded pivot pin, the 21-001, looks fine. You will need to replace the other three with the 21-007 spring loaded guide pins. See our video below on installation. Note that you will not need to use the 21-154 pivot rod clamp on these three spring pins, just on the bottom pivot pin.

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