Originally Posted by
tomtomtom123
There's one OEM model replacement widely available but it comes in varied packages, some with a similar thin brass bushing or with a thick plastic POM.
Would the brass bushing or the plastic POM perform better, be more stable under the high bending of the really long folding bike seat post, or last longer?
I assume the POM is easier and smoother to operate, but some risk of it falling apart if clamped tightly.
Polyoxymethylene AKA acetal AKA Delrin is a pretty tough polymer, and it has self-lubricating properties - it's a good material for jockey wheels, but Simplex made whole derailleurs from the stuff.😩 Is the other type brass or bronze? Generally bronze is self lubricating but brass is not. The seatpost should be a good fit in the frame so the clamp is only stopping it from sliding, not seeing much bending force.