Hi Troops
Thanks John, will try that

knew there had to be a way ...
Bill, Tried that first way. Owing to the radius of the cutter, ( 10DP ), it's possible to move the quill fine feed up down by about +/- .020" before the trapped feeler guage looks anything other than vertical. I assume that's what you were describing.
Regret I have no idea what the other method is ...

C - O - C ??
I only have a HND in Electrical Engineering, anything vaguely resembling two bits of metal banging together ... I'm utterly stuffed ...

It had occured to me to use the Myford 2MT drilling pad I have. This has a Vee-groove across it. I presume it is truly across the centre ??
Genuine Myford. I suppose I could try it, then verify with John's method ... like this ... att.
Dave BC