I just put a 1" threaded fork in my frame which is set up for 1 1/8 threadless fork. I don't know about doing it on a threaded-to-threaded conversion.
Here's a post where mine was discussed. http://www.ratrodbikes.com/forum/index.php?threads/1-fork-in-1-1-8th-headtube.79563/#post-768992
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