I'm one of those people who gets his regulators serviced every 12 months by the local dive shop. Call me crazy, but life support equipment should be in proper working order at all times.
What secrets are kept in the back room of the shop where tired regulators find new life? For one, a thorough service manual filled with images, instructions, and warnings. They're kept out of the layman's hands but undoubtedly an excellent resource to better understand regulator technology.
A diver in Finland has done us a favor by compiling all the service manuals he could find: Apeks, Aqualung, Beuchat, Dacor, Dive-Rite, Mares, Poseidon, ScubaPro, Seaquest, US Divers, and Zeagle. How he came into their possession falls under my "don't ask, don't tell" policy, but most of the 170+ manuals and related documents are in PDF, TIFF, and Flash formats. Get yourself better acquainted with your gear by downloading the ZIP file (grab a snack...it's 168 MB in size).
Divester does not condone running with scissors, using a mobile phone while driving, or servicing a regulator unless you have been properly trained and authorized to do so.