Originally Posted by Azreal911

I wouldn`t worry too much about used dahon`s what i was talking about are extreme cases where they use them day in and day out for a few years. if the fold feels like there`s friction and there is no wobble in the hinge when the dahon is in a half fold (like 90 degree angle or something) then it should be good. When there is some friction to me the hinge is still nice and tight and would last quite awhile. You can try add some oil in there to penetrate it to make it last longer and leave the bike upside down when you put a few drops in that hinge pin. It worked awesome for my wife`s dahon jack because it was overly tight and was soo hard to fold. This would ONLY be for dahons! bromptons and terns don`t act and feel the same when you check their folding mechanisms. I`ve read in the past on the forums one user used their dahon an extreme amount and the fold was pretty much done, not sure what was the resolution or did he have to get a new bike but i couldn`t find that post. for casual use you should have zero concern of the hinge ever wearing out.

for the terns you can just buy new bushings:
Igus Bearings | Tern Folding Bike and Folding Bicycle Accessories | Canada
Thorusa sells them for $5 a pair lol. so yeah that`s all you really need to do with the terns.

as for bromptons they are steel on steel so and not steel pressed into alumnium so i haven`t heard of anyone coming into the same problems at all with brommies. something with the chemistry which i cannot explain .

hope this helps.