Newer Smart 451 owner here.
Friends Cabrio canvas top goes back fine, but once it gets to the back where the roll bar type mechanism is supposed to fold back and down, it does not do so.
Again, the canvas slides back fine and 80% of the top is open, when it gets most of the way back, the mechanical mechanism that folds back the last 20% doesn't work.
Anyone else had this problem? Any tips or commentary is welcomed.