If there are no scratches in the metal, it is fine to start with 1000 grit. Then move to 1500. Then move to 2000. Make sure you are using a lot of clean water and a good flat sanding block. Then afterwards move to a good polishing compound. I prefer 3M Rubbing compound, which can be bought @ Wal-Mart.

All in all, it is a good 4-6 hours worth of work.

And here is how it could turn out.....
and another one, although it is too crowded to see the detail.
http://i18.photobucket.com/albums/b1...nternals-1.jpg