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Before getting started, you will need to know the following:

  • The measurement from the middle of your door handle (if you have one) to the middle of the keyhole
  • The measurement from the middle of your cylinder to the edge of the door (this is called the backset)
  • The measurement of the thickness of your thumbturn or key (depending which you have) and how far it protrudes from the edge of the door
  • Any markings on your cylinder, for example, any star markings and the amount of stars

Does your door have one central locking point or multiple locking points?