Originally Posted by Roelof

On the inside of the sleeve when dremeled on the ports I use a small diamant grinding bit to take away the sharp edges. The chrome layer does not need to smoothen, when pinched you need to hone it with a rock to create new scratches, I was told you can find one in a automotive shop normally used for brake cilinders.

On the outside I do not do anything, after grinding they are smooth enough and there are pro's and cons to smoothen it.