I was able to lower the turn signals, but now they are not connected to that bracket anymore. I put them on pretty tight though, and it seems to work just fine. Thanks for the help.
I moved my signals long ago to accomodate a batwing fairing.
I believe the purpose of the bracket is (at least partly) for positioning the turnsignals so that they point straight ahead. If you can't do this by eye, a yardstick laid across the face of the turn signals before the final tightening will accomplish the same thing.