26 tpi**********? isn't 24 tpi the standard for 1" forks?
I actually have my original fork out of my 78 or 79 (never knew which it is) Competition G.S. I'm sawing off the threaded part and going to braze in a non thread piece from a used fork the bike shop gave me so I can make it threadless.
My thread gages tell me that my original and the junk fork that looks like it came from an early mountain bike are both 24 tpi.