My headlight stalk threads are stripped good. See picture. It seems to originally be a 1/2 inch 16 pitch thread originally? I have a die set but do not have a 1/2 inch 16. I am not sure what size to use or what to do at this point.
I believe the size is 1/2 x 20, same as the earlier gas headlamp forks. From the looks of the area where the threads used to be, you could build up the shank by welding, then file it down and re-thread, but I think the easiest repair would be to cut the damaged part off completely and weld in a new threaded section from a bolt or threaded rod. Be sure to Vee both sections of the cut so you can get a good fill with your weld.
Maybe you can file it smooth, rethread it 7/16-20" and use the smaller nut with a washer?
I second Roger's recommendation - file to the next size down and cut threads for a smaller nut.
Yes, ½-20 is correct. But it's toast. You won't fix it by just running a dye over it. I agree with R.V. if you're set up for welding. If not, it may be less costly to get a replacement. For a 1924 it should be relatively easy to find.
I might have some stems with out the bucket that you can replace, Bob
A decent headlight bucket is pretty easy to find. If your not in a big hurry look at Ebay, The MFTCA classifieds and the Fordbarn. They are on there from time to time.
Clean up and re thread to 7/16, lot less work then the other suggestions. Very, very few people will know the difference. Oh, you might want to add a washer sized just a little bit bigger then the nut.