[Bob Bidonde]

Hi Clem,
Putting the bottom line first, the worm gear and its thrust bearing of the early 1930 2-tooth steering is not interchangeable with the later 1930 and 1931 steering gears. So if a rebuild of an early 1930 2-tooth sector steering gear is necessary, the worm gear and its thrust bearing needs to be replaced with the later design.

Here is some homework for you Clem. Study the Ford Service Bulletins of August 1930, Page 481 and December 1930, Page 517. Apparently there was trouble with wear in the 2-tooth sector steering gears, so Ford changed the shape of the worm gear's bearing journal.