The spring broke in the locking door knob on my garage to house door. I would have just bought a new one but that would mean 2 sets of house keys. A neighbor replaced all his door knobs a while back and gave me some of the old ones. Since I never lock the door I thought about just replacing the broken one with one he gave me. Then the McGyver in me had a thought. I checked the spring in the one my neighbor gave me and it looked like it would work in the broken one. Removing the good spring and the broken one were not a big deal. The fun began when replacing the spring in the locking knob. I thought I had it but it only worked in one direction. I finally got it all back together and working like it should. I do not recommend that anyone try this unless you have a lot of patience and some time. It is one of those things that definitely has a learning curve.

If you have Kwickset locks, they make a lock that you can replace and key it to your old keys. Takes about 5 seconds.

Otherwise, like said above have the hardware store re-key it for you. If you have the tools and tumblers it takes probably takes 5 or 6 minutes if the guy knows his business.