acinsp1
I've got the same play in that pin myself. The head started out tight but has developed that bit of play with flight time and couple of blade strikes. It does not, however, seem to affect flight that I have noticed.
While I have yet to install them myself, I've seen fins others have installed on their micros. Some of carbon fiber and others of various plastics. CF's definately looked the best. According to them, it improved tracking in ff. I'm going to install them myself if I ever get around to it.
Mark