Hello All! Today my old Brompton T5 (1999 model) with a 5 speed Sturmey Archer hub slips on the first gear when I pedal it with force even flat ground. Does anyone experienced the same problem with their Brompton? Would that be cause by the internal cog/gear damage or does it simply needs some kind of adjustment? If the hub is really defective, is it still possible to get a replacement for such an outdated hub? On the hub it has the following information "Made In 99-7 England, Sprinter". I heard read someone mentioned the 1st & the 5st gear uses the same cog or part. I then tried to see if the 5th gear slips with force but the 5th gear is good even when I step-up pedaling it. My other M3L does not slip at all. I appreciate your help. Cheers!