So how did it go . . well ok except that I dropped a b@@@@k

Cutting the female thread somehow I managed to set the lathe up for 1.75 mm pitch and not the 1.5 mm that it should have been - silly error involving putting a selector lever into position '6' and not '8'.
I remember making a scratch cut to check pitch with a thread gauge, the gate alarm went off announcing a visitor, I went and dealt with them, and came back and cut the thread WITHOUT checking the pitch. I got a funny feeling about it when I'd cut about 1/3rd of the depth, checked, had a hot flush, set the pitch correctly and re-cut the thread. It actually doesn't look too bad, but I'm concerned regarding it's tensile strength - if it strips the chuck will let go of whatever it is gripping and that's not a nice thought.
So I've decided to make another one

However I continued finishing this one off, made a slight design change reducing the outer diameter from 82 mm to 79 mm which allows it to pass through the chuck converter flange, making assembly easier.