I used silicon caps (for 5 mm diameter shelf pins) such as the one shown here. Cut the closed end to obtain ~ 0.75 cm length cap and inserted them over the plastic parts at the two joints. It was a snug and secure fit.
Inserted the long plastic components from the side shown in the second image and secured in its slot first on the other side before pushing it out with a flat screw driver and inserting it into its slot on this side shown in the image. It ran smoothly after the fix. It remains to be seen how long it will last.
Another user, Eric Hargis, recommends as another alternative putting an old spring over it
Yet another user, lszablya recommended a different twist: "I used double wall heat shrink tubing. Looks like it sucked in around the prongs just fine."
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