Instructables
Picture of How to Re-Pin a Lock With Original Key
After having gone through the process of explaining how to re-pin a lock without the original key, I realized people might want to have a similar explanation for re-pinning a lock you've just bought.

This is actually a lot easier than re-pinning a lock without a key, it also helps that I had a new Kwikset locking door knob laying around. Not to mention, it also talks about how to go about re-pinning a different style doorknob. If you have the other style doorknob, it should be pretty easy to figure it out after reading this.

After doing this a few times, this shouldn't take more than 5 minutes to finish, but, again, it helps to have detailed instructions.

Things you'll need:

Kwikset Re-Pinning Kit
Doorknob with lock.
 
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Step 1: Removing the Tumbler

Picture of Removing the Tumbler
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So, for this, you have two different keys and one brand new lock. Start by taking the whole apart, usually just by pulling on each handle and the two parts separating. After doing so, you'll need the removal tool. It's a Y-shaped piece of steel that has a variety of purposes with Kwikset locks. It is shown in Pic 2.

With the part that you would put the key in, there should be a little tab behind the handle, as shown in Pic 3.

Insert the original key into the lock and turn it around a bit (Pic 4), then take the thin end of the removal tool and push the tab in. It's a little difficult to take a picture and do this, but you'll need both hands. As you press in with the tool, eventually you'll find a catch with the key, usually in a line from about 10 to 4 o'clock. if 12 to 6 o'clock is the starting point. (Pics 5 and 6).

Then, pull the handle portion off, invert it and the tumbler should fall out (if you've taken out the key). Everything should look about as it does in Pic 8.
Cool. Thanks for postings such a great instructable.