Good evening,
Thanks for all your replies, this is why I joined this site.
I think I will apply Occam's razor and try the easiest to produce method first, I'll turn a piece of brass to fit the tailstock and either
drill a hole or make a conical indent in it to hold the end of the shaft. Plenty of grease as suggested.??
If this proves problematic I already have a suitable bearing and m12x1 tap and die so I'll manufacture something from scratch, along the lines of a threaded stub for the chuck
and a female threaded block complete with bearing mounting hole for the tailstock.
I will let you know.
kindest regards,
David