If it's nickel I would try semi chrome, it's a paste and it VERY low abrasive wise. I've never used it on nickel but have used it a bunch on chrome and they are similar hardness wise. It works very well and doesn't leave any swirl marks. You may be able to get it at auto parts stores but any local motorcycle shop should have it.
If the pain is lacking so is the discipline...
"the only 911 call I need is chambering a round" - Mr. Muller, MO car dealer