What cause my ignition key to spin around in the ignition switch?

This is a complex car, I would go to www.alldatadiy.com and pay a little for access to the repair manual, that is if you have mechanical experience, if not, then: here are some shops: https://repairpal.com/bmw-repair-in-greenville-mississippi

Autozone have some popular workshop manuals for free on line once you register (for free) on their website http://bit.ly/autozone_repair_info. There is a company that independent auto repair shops get their information from, this same information is available inexpensively for people that work on their own cars.. The information is year make and model specific, covering repair procedures, torque specifications, fluid capacities and specifications, service bulletins, component locations, wiring diagrams ect.... Alldata is very easy to navigate http://bit.ly/AllData_Repair_Manuals_Online