Originally Posted by
Plainsman
I’ve also looked into simply replacing the lower section of the telescoping tube with a longer section but have not been able to find anyone who makes a 33.9mm tube of sufficient length (580mm) which has a binder at the top - seems to be a pretty specialty piece of work. Bummer because I bought this bike which fits and rides well, but which I can’t fold and store as intended.
1.375" tubing (with various wall thicknesses and almost any length) is commonly available and is ~1 mm thicker than your desired 33.9mm. I would think any machine shop (or even an amateur with a lathe in their garage/basement) could turn it down to size. I don't know how the binder attaches, but if it's just a reduced diameter section at the top of the tube with a longitudinal slit cut in it, that too is easy for a shop to do. Of course, even though a machinist could do this in a few minutes, it would probably cost a pretty penny from a professional machine shop.