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You can try using a 32H hub for a 16H rim. The difference in spoke length is not likely to be large enough to cause a problem.
If you're lacing "radial", there won't be any difference in spoke length, but the spokes won't be truly radial, one side will be pulling and the other side will be pushing, which means the hub shell will have a permanent torsional stress in it. Like many bodges, it probably won't kill you, but if you have any sense of mechanical beauty it will annoy you :)
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Exactly he can try it knowing it not perfect. He may also find it looks radial even if its not strictly 0x. For the cost of a novatec a171 hub it might be worth a try. Of course royce do 16h drillings solving the problem.
Typing 16h hub into ebay gets results. There is some bloke with 16h dura ace hubs. I thinkmi sold them to him a couple of years back.
Using ERD measurement means you dont need to know rim thickness. use spokecalc you don't need to know this and spoke lengths come out right every time.
You can try using a 32H hub for a 16H rim. The difference in spoke length is not likely to be large enough to cause a problem. Could be wrong though never tried this. I have done a 12H hub into a 24H rim and those wheels are fine, I ride them. spoke lengths were uneffected in reality, even though some predicted doom.