bifold metal doors scrape on the track. Need replacement

A quick learner from Desert Hot Springs, CA says:
What do we replace? see photos.
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Paul from SWISCO responded:

There are two options you can do here. You can either replace the nylon cap, our 21-103 or the complete pin, the 21-072 . You may also need to adjust the bottom threaded pin to raise the door to square up the door and keep it from scraping. Look these options over and let us know what you think. 

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