Inserting a 40 steering shaft into and F-100 Worm Gear

[TomT/Williamsburg]

OK - I am rebuilding the steering box in my roadster and still want to use a 40 wheel. So. I bought a F-100 rebuild kit which has a worm gear sans the shaft. I have a 40 shaft that I want to insert into that new worm gear....

So, anyone done this? Tips? How to get the 40 column woodruf key slot in the right position so my steering wheel isn't 90 degrees off when driving straight?

Thanks for any help you can give .....