Ford 2003 Mustang Workshop Manual page 789

Remove the ignition switch lock cylinder.
Use a 1/8-inch diameter drill bit to drill out the lock cylinder retaining pin.
Use a 3/8-inch drill bit to drill down the middle of the ignition lock key slot until the ignition
switch lock cylinder breaks loose.
Remove and discard the ignition switch lock cylinder and clean the drill shavings from the
steering column.
6. Remove the bearing retainer.
7. Remove the bearing and gear.
Thoroughly clean all drill shavings from the steering column and inspect it for damage.
8. To install, reverse the removal procedure.
Install a new ignition switch lock cylinder.
Verify ignition switch lock cylinder operation.