Strolling through Havana you often find people fixing their cars in the middle of the city. The old American cars from the 50s tend to break down frequently and sometimes in the middle of the street. Due to the governments constraints the spare parts are in short supply and the people have to use whatever tools and materials they have at their disposal.
Many private business owners or taxi drivers are dependent on their cars to run properly so they either fix it by themselves or bring it to a repair shop. Buying a new one is not an option since the new cars that are imported to the country are only for government owned businesses.