If I understand your question, you want to remove the paint from the edges of the lugs? You can buy very narrow Riffler hat'll work very well to do that. You can get such files at many hobby stores, jeweller supply stores and even some big box stores.
They look like these:
http://cdn.toolstation.com/images/13...bbig/24550.jpg
two cutting ends and are curved. You should be able to get one that's just the width of your lug thickness.
Cheers from Miele Man