Thank you both Hopper and Brian Wood.
I am making a shaft for a gear cutting head on my vertical slide,as I want to turn and cut without moving the gear.
I designed it with a 25 x 1.0 pitch thread as I advised above.
What I did was just change the thread to a 26 tpi, as I had to make the nut as well.
I seem to have an extra 60 and 65 tooth gear.
I will replace one 60 for the 63. Thank you for the packing list of gears.
I can keep the 65, as its can be used for cutting Diametral Pitches of…
23, 25, 27, 30, 46, 50, 54, 60, 92, 100, 108, 120.
What an exceptional little gearbox it is.
Thank you
Noel