Many thanks for your replies Brian and IanT.
I am currently thinking of replacing the headstock with the new
big-bore headstock from Myford.
Am going to the w/s a little later to endeavour to find the serial number.
The front bearing is oiled through an oil cup which I see feeds through
a wick.
Will send more info when I have been into the w/s and got these old
eyes working!
Have emailed Darren (ex Myford fitter) to see if he would come down
and fit the new h/stock for me as I am now a little too old (82) to start
pulling the S7 to pieces.
Richard.