Bi-fold closet pivot cap

(n.b., this did NOT fit my closet pivot, due to my misjudging some dimensions, and not realizing that there was a flared lip on the pivot, hidden by the broken plastic piece over it (I didn't remove it until I got the new 3D-printed one); the other bifold pivot "thing" is much closer to the intended piece it is replacing, with two different sized "holes" to allow the bushing to slip over the pivot's flared lip (see image))

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Plastic cap (basically, a bushing) to replace the broken one on my outdated and no-longer-available, top pivot, spring-loaded, post/guide for a wooden folding door, which is about 30 years old as of 2018 (no retailer had a match for it, and no modern pivot/cap fits). The cap takes no weight, and is used only to guide the closet door through the top rail/track. The cap is hollow to allow it to be placed over the metal pin, which has an interior lip to prevent the cap from popping out (i.e., I can't get the old cap off the pin without using a vice and p