Mackie,
Absolutely correct. 1/4-28. I'm old lets not forget. Been a while since I've handled on let alone made any on the lathe. Had to try it. Not a big deal at all. Not worth it considering the tiny amount of cost to purchase. Point being, I knew they are 28 tpi and my head in my arse caused the lack of oxygen to the brain.
My apologies to one and all.
Max