seeking referrals for a contractor who knows how to properly install a ceiling fan

See this request from a Quincy Place NW resident:

Can anyone recommend a contractor who specializes in -- or at least understands well -- how to properly install a ceiling fan? I had my contractor install two fans, but I think the fan boxes are loose because they rattle. He came back to fix them, but they are still rattling. I think the fans need to removed completely and remounted after carefully anchoring down the box. I'd really appreciate a good lead on someone who has experience with ceiling fans.