Assuming the bolsters are either nickel or brass, it's quite easy to make 'em shine again. Some wet/dry sandpaper wrapped around a soft(ish) rubber eraser works very well as a sanding block. Depending on how deep the scratches are, anything in the 400 - 1000+ grit range should clean them up pretty fast. And 2000+ grit will start mirror-polishing it. Nickel and brass bolsters are very soft by comparison to the SiC/AlOx abrasive of the sandpaper, so it works fast. Follow the 2000+ grit sandpaper with some Flitz/Simichrome polishing paste on a soft & clean rag.
You might also be able to use a Scotch-Brite pad to clean up the scratches, though I can't guarantee it'll take it to the same high polish as the high-grit sandpaper.
BTW, the Dremel might work, with a soft cotton buffing wheel and some polishing compound, but only if the scratches are very, very light. Keep the wheel moving; don't linger in one spot for more than a second or two (overheating/scorching), and keep the wheel away from synthetic handle materials like Delrin/plastic (it'll melt them quick). If the scratches are very deep, I'd avoid using the Dremel with anything more abrasive (more potential to do damage, than repair). The safest option, to me, would be the sandpaper by hand.
David
