The system works similarly to the Velib in Paris, Baltic Bike in Riga, and other schemes in cities around the world.
Well, do not worry because there are plenty of things that you can do and see for free (or cheaply) in this exciting city.
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You can use screws to attach it safely to the tray as well as cushion it with some aluminum baking foil. Whenever a dealer is selling a used unit, they must jack the price up in order to make a profit.