IF, you would rather not buy new mirrors, the best, easiest and most economical fix is to take the mirrors off, and tighten the INNER, smaller nut. I added some BLUE Loctite. Then once you put the whole thing back together, you should be in good shape. With that in mind, I did add some mirror extenders. I don't mind the vibration, as I come from a Dual Sport background, and once you get the RPM's over 4,500, everything smooths right out. Enjoy!