The nickel finish should not be cleaned with any Ammonia based cleaner as it is detrimental to the nickel plate. Very carefully take off those Pearls and make sure any rust is not forming on the frame underneath. Those grips (stocks in S&W lingo) are held on by the screw that is obvious, but there is a blind locating pin in the center of the frame bottom (butt) that keeps the grip aligned to the frame. Do not pry them off as they WILL be broken.

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Mike Maher #283