Check Adolph Gasser... he used to be the top Nikon guy. You can also ship your lens to Sacramento to be repaired go to www.camerarepair.com
(they are FAST, reliable and less money than others I have used.
I had a problem with an F4, shipped it to Sacramento and next day phoned to see if it arrived. They said, "Oh yah, came in this morning and it is finished and in our shipping department, you should have it back tomorrow!"
Name of co. is California Precision...