When the key is aligned and removed the pin springs push the top and bottom pins down locking the cylinder in place.
How to change door lock cylinder without key.
Prop open the door as you change the lock.
Look for a small set screw at the base of the handle.
The top pins and bottom pins line up along the shear line when a key is inserted allowing the lock cylinder to spin freely.
How to remove a door lock without a key.
Quick lesson in locksmithing.
Changing an interchangeable lock cylinder 1 remove the flat screw under the latch.
Insert another flathead screwdriver under the edges of the tabs holding the lock cylinder in place within the housing.
Open the door and look for the latch plate along the door s edge.
Insert a flatheaded screwdriver into the spindle housing hole.