daveb,
Are you referring to the item at bottom right of the second picture on this page: **LINK**
http://www.lathes.co.uk/lorchschmidt/page4.html
If so … it's a fixed steady
Sorry, I evidently don't understand the original question.
MichaelG.
.
P.S. … The 'split bearing' would probably have been custom made from wood, for each job.
P.P.S. … It's not the same; but here is an ineresting idea, which you could adapt to fit your frame
http://www.ptreeusa.com/turning_tools_ron_brown.htm
Edited By Michael Gilligan on 09/02/2017 16:45:12