I want to remove some minor scratches from a stainless steel S&W to touch up an original finish.
I'm thinking eBay would be the place to get the Scotch Brite pads, unless somebody has a better recommended supplier...
I my neck of the woods, a dedicated paint store, a Sherwin-Williams store, carries a variety of Scotch Brite pads.
Scotch Brite pads work well to touch up a BRUSHED or SATIN stainless steel finish.
There are 3 basic finishes for a stainless steel S&W revolver.
1. Brushed or Satin. This is this factory original finish for your revolver.
2. Bead blasted or matte, a dull uniform, finish.
3. Polished. Sometimes confused with a nickel finish.
Scotch Brite pads come in different levels of coarseness.
Light Grey, called Ultra Fine Hand Pad - (600-800) 800 grit.
Green, called Light Duty Hand Pad - (600) 600 grit
Maroon pad, called General Purpose Hand Pad - (320-400) - which is very coarse for removing deeper scratches.
Study your revolver finish or the finish of another one and follow the direction of the pattern you see from the factory.
STROKE IN ONE DIRECTION ONLY.
Work in a small area with tiny (1" square) piece of pad and
stroke in one direction only following the linear polishing direction from the factory. Avoid any surfaces but the brushed stainless surfaces. In your case where the entire side plate seem involved you should remove the side plate screws. Start in the most unobtrusive area first to make sure you get a feel for it and like the result. Go slow, literally pushing the pad fairly slowly, and use a light hand. Start with about a pound of pressure. It doesn't take much. Generally the green pad can be used for all applications varying the pressure dependent upon the degree of the scratch you attempting to fix. I think it looks best to finish off with the light grey pad. You might consider viewing You Tube for examples of how to do it.
Best of luck.