go to EDIT GARAGE then go to FUNCTIONAL... They work similar to repairs, they time out and you click on them for cash. Just make sure you have room for them.
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"They that can give up essential liberty to obtain a little temporary safety deserve neither liberty nor safety."
-- Benjamin Franklin
lib·er·ty
/ˈlibərdē/
noun
1.
the state of being free within society from oppressive restrictions imposed by authority on one's way of life, behavior, or political views