Do you know what the thread is? Many used fractional screws, or number screws with threads that are no longer standard, but there are quite a few suppliers of special taps and dies.

Wholesale Tools, Victor Tools and MSC to name a few are good places to start. Most tool houses can supply specials, but you might have to contact them as they are not listed in the catalogs.

ooltewa, Its a little late this eve for me to have my 'thinkin cap' on, but marlin ballard liked 40 thread for just about every thing. If you have access to a small lathe, all you'll need is a handful of small adjustable dies no. 4,5,6,8,10,&12. All are 40 thd. They must be the adjustable type because I think at the time, they they were designed as fractional dimension screws, but the adjustable die will open up enough to accomodate the next up fractional size. Probably, some fellows on this forum, can tell you just what the fractions are but theres no trick to it. Just mike up the old screw at an unworn point and match that. I,ve been making them this way for a lot of years. Nos. 8,10, & 12 are the sizes you need for the action parts. The other sizes only rarely. Good luck, hoot

Hoot, 
you can remove or edit a post by logging on then look at the upper right of the post. You can edit the post to correct a mistake or remove a post. 

                                                                Joe.

Ooltewa.
I have contact information for a fellow that makes Ballard screws to order. PM me if you are interested. I'm not sure that he wants his phone number public. Check YOUR PM.

Bill

Thanks westerner, I learn a little every day.  hoot

Gentlemen: In those early days, we in the US didn't have the best of tooling. Consequently most of the larger manufacturers bought their machinery from England. So it is quite likely that those odd sizes are Whitworth. English standard. Just my 2 cents, thought I'd add a little food for thought.   Don