Surprisingly easy actually. Mine is already polished, but I polished the rear houseing and a few other aluminum parts I made for the rear end. I split a 1/4" rod with a hack saw to hold a strip of emery cloth. Used it in a drill to get into the tight spots. Then used finer and finer sand paper. Then used rubbing compound and polishing compound to finish it off. I bought some of those inexpensive yellow gloves to do the final polishing. To me they work better than trying to hold onto a little piece of cloth while trying to get in tight spots. Worked for me.