I purchased a new Dahon Speed D7 a couple of weeks ago. Within the first two weeks the little plastic sleeve inside the latching mechanism that holds the handlebar stem to the frame cracked and broke. In its current state, the handlebars will not latch. Has anyone else had this problem with their Dahon folder? If so, did you come up with a solution besides buying another of the suspect plastic pieces? I was briefly impressed with my Dahon, but this seems like a fairly fundamental design problem - a small plastic piece under stress being the weak link in the usability of the bike. Any suggestions for fixes would be welcome.