Here are some messages that I located on the Nikonians web site (www.nikonians.org -- an excellent place for information on Nikons):
"About 10 years ago Nikon recommended John White (mentioned in earlier thread at referenced website). He converted three lenses for me. Very professionally done. I've since sold those lenses."
"John White did several conversions of non-AI lenses for The Bay City (MI) Times where I worked. The 300mm I wrote about was one of several lenses done by John. His work is very high quality and I recommend him highly. I did not mention his name earlier as I didn't know if he was still in business. Happy to hear he's still "grinding away"."
"I had John White at aiconversions.com convert four of my manual focus non-AI Nikkor lenses when I purchased my F-100. All the lenses now work perfectly both with my F-100 and my old FTn."
I have had two older lenses converted by a local repair shop. They function perfectly but look pretty rough. From what I have read, I think John White will do a better looking job than I got, but probably at a higher price, too.
EDIT: I checked his prices - they are right in line with what I paid (except that I didn't have to pay for shipping). So, from the recommendations quoted above, it appears that you can get a very nice job for a reasonable price.