[Dave at Pelican Parts]

They stay retained because of those flanges; those are much bigger than the bore for the bushing and keep the bushing from moving out. The rear part of the rod keeps them from moving in, and the pin keeps the joint together. No need for wrapping anything, because the bushings will stay in place as long as the flanges are there.

And if those break off, the bushing has already failed well past the point where it should have been replaced.

--DD