when i got my gp100, and sp101, i got a copy of iowegan's book of knowledge, or IBOK, as it is known as on the ruger forum. he wrote it, and printed it out. step by step procedures to fluff and buff the internals. he is a retired gunsmith, and hangs out on the rugerforum.net, highly respected man. i still have mine, but won;t sell, its no longer available, but if you get a chance to buy it, do it, its worth the money. pictures, and details on the trigger group, really made it simple. the only spring i changed was the trigger reset spring after i completed. one thing to remember, always dis-assemble the trigger group in a plastic bag, it helps to keep the springs from being lost, they are tiny, and they can fly.