In addition to files & stones to shape things, make them smaller and polish them, there's also the coated abrasives (aka, sandpaper). John mentioned emery cloth and it comes in coarse, medium & fine grits - and fine emery is still quite coarse. I also use 3M or Norton wet-or-dry silicon carbide sheets in grits from 80 down to 2000. Auto body supply stores have the real fine stuff as well as Crocus cloth - which is good for polishing certain metals.
Regards
When you can measure what you are speaking about, and express it in numbers, you know something about it; but when you cannot measure it, when you cannot express it in numbers, your knowledge is of a meagre and unsatisfactory kind. [Lord Kelvin]
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