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The security of a vehicle against is evaluated through of a classification denominated Thatcham, in order to obtain better insurances prices. The methods of theft have been improved over time, and therefore, the design of Mechanical Steering Column Lock (MSCL) also requires technological improvements. This work presents a design modification in the Mechanical Steering Column Lock (MSCL), with the objective to have a better security classification. This is a device that acts on the locking of the steering column, to protect against car thefts, called Deadlock. The timeline of the project and new design were discussed and defined between the Supplier and Product Development team, where was revised all the FMEA, Design Verification Plan (DVP) and Test Specification. Through this design, in addition to the decrease in the price of insurance, it was also possible to improve ergonomic comfort by ensuring a rotation in the position of the key mounted on the ignition cylinder.