A friend handed me a box of tools, and in the box was a number of stanley block plane parts. 

One of the brass rear adjuster knob has a damaged thread at the start of both openings. I would like to save it but I’m uncertain of the thread sizes used. 

The plane is a Stanley block with adjustable toe, Its dated 2-18-3, I’m away visiting with friends so I don’t have access to my books, taps, dies etc. If I can repair it for him, it would be apppreciated.

I have a number of old Stanleys but I must admit I never had bad threads, it looks like 1/4 -20 but I don’t like to guess when I can ask.

thanks

Ron in Peabody