My 1975 Nishiki International was recently stolen so I had to find myself a new bike. I liked my nishiki so I settled for a 'fixer-upper' 1977 Nishiki Competition. I cleaned her up and noticed something odd; The handlebars, as they twist, seem to "stick" directly in the center. It twists freely all except when centered where it almost is held in place. I'm not sure if this is intentional or if it is something I need to fix somehow. Any ideas?