There is a pin through the base of the grip that has to be removed to get at the spring. Push out the pin and a piece of the grip can slide out. Looking top down at the grip piece you'll see a plunger being held place by a brass pin. Slide the pin out of the way (your spidey sense should tingle; the hammer spring is under tension and will take any chance it can to jump out to freedom), remove the plunger and the hammer spring is underneath. ta da.
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