The surest way to screw up the cosmetic appearance of a S&W is to not take the side plate off properly. My recommendation for people who have never done this is to spray the insides with a good oil, then blow it out with compressed air.<br>
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But, if you really want to oipen it up, get a set of gunsmithing screwdrivers. These have hollow ground blades and won't bugger up the screw slots. Remove all the screws on the sideplate. Then, holding the gun by the barrel, strike the grip frame with something like the wooden handle of a hammer. Do this repeatedly until the side plate comes off. NEVER NEVER NEVER pry the sideplate up. This WILL, I repeat, this WILL raise a faint lip along the edge where the sideplate meets the frame and uglify your gun.<br>
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As for the guts, my advice it to not disassemble them unless you absolutely must. Some parts are tricky to get back in, because they are spring loaded. If you want to do this yourself, get a good book that shows the proper sequence.<br>
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Or, you could simply ask a local gunsmith what he charges for internal inspection, cleaning and lube on a S&W.