Nick.P .....Carbs are not the easiest thing to polish.
In addition to all the little, hard to get at, nooks and crannies, the metal itself doesn't take a shine all that well.
This is because alloying elements such as zinc are neccessary to get the molten metal to flow freely into the intricate bits during the casting process.
No reason why you shouldn't do it though.
I'd suggest a dremel type tool coupled with a selection of various shaped miniature felt mops for getting into the corners.
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