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Easy Three Step Lock Change:

1.

To change entry knob cylinders, simply insert the master/control key and rotate it 1/4th turn counterclockwise to the 9:00 o'clock position...

2.

...and pull gently. The cylinder will follow the key out of the knob.

3.

Then, simply insert the master/control key into the new cylinder and rotate the key 1/4th turn counterclockwise. Slide the new cylinder into the knob and turn the master/control key 1/4th turn clockwise to the
12:00 o'clock position and remove the master/control key.

The cylinder change is now complete! After practice, typical time to perform this
task is less than 5 seconds.