I’ve had my Dahon MU to about nine months and have really gotten to know the bike. One feature I really like, enjoy, even treasure is the seat post pump. It really does operate like a floor pump. But there is/was a problem. Over the last few months it has been getting harder and harder to push the rubber hose back inside the seat post/pump shaft before clamping the post back into the bike frame. In the last week I’ve had to grab the hose with needle nose pliers while twisting and pushing with considerable force to break the hose free from it’s inflation position. In frustration I finally cut the hose just beyond the brass hose bib and reinserted the “fresh” hose end over the bib and voila it works like new.

The rubber hose is pretty long so I suppose I will be able make this fix a number of times, but did I do anything to cause the problem and have others experienced the problem? The only thing that comes to my mind is that I lubed the pump with a wet chain lube and maybe this caused the hose to swell or become sticky. Any ideas?