Quote Originally Posted by m_c View Post
I've just checked mine, and it's just a V, with no S.
I can't find the bearing details, and it's not easy to get into measure them without dismantling things.

However, the ML10 page on lathes.co.uk indicates there's not actually any difference in the taper bearing headstocks between the different versions-
The only number that I can see on the bed of mine is A6483 (stamped on the reverse of the bed, about 10cm along from the chuck).

So it appears that the speed limitation is a product only of the pulley system, and not the bearings.