I'd like to second what Chuck Jones recommended in his post...I take apart the same things and don't take apart the things he recommended you not disassemble, like the hammer and trigger sub-assemblies. A solvent soaking or carb-cleaner spray is sufficient at that point and I do that same procedure with every used S&W I buy. The only other things I do is stone the rebound slide, put a lighter rebound slide spring in, and look for any signs of parts rubbing, and of course a light lubrication prior to reassembly.