Re-keying door locks?

[bgsterling at bluebottle.com (Brad Sterling)]

<snip Nate> 
there is a procedure to re-key the tumblers to match a given key, anyone
know how? 
<end snip>

Another idea (stolen from the archives) is to hit the junk yards and
scavenge a bunch of different brass tumblers from various A1s (maybe
others?).  Then pull your lock cylinder with the key in place.  Keep trying
the scavenged tumblers in your current lock until you find the proper mix.

-Brad
'86 Scirocco 16v