Thanks for the reply,
I'm trashing the Chinese break out board and today I spent my Pocket Money on a Ethernet Smoothstepper with a Motion Control breakout board.

I like the Break out board because the Smoothstepper sits nicely atop it.
So thanks for the advice. I'll have to wait a few days for the delivery but in the meantime I can look at my encoder disc and get that sorted.
I do believe that you mentioned in another post that only one slot is all that was needed.
Reading the Mach Lathe manual Art says 3 narrow slots and one slot 50% larger than the other 3.
If I only need one slot then the encoder disc on my spindle shaft should do as it is. It even has the original mount for the slotted opto! (picture attached)
George