Hello there I have an ML4 and have fitted the toolpost and holders made by Lyneham Engineering. They fit and perform very well and they offer a very fair priced set of post and holders, on that well known auction site, although you may have to change the toolpost stud to 7/16"dia, or make a bush. The quickchange toolpost and the holder are Dickson pattern and on my lathe 10mm tooling is fine but 12mm tooling needs the toolholders to be relieved on the base.RDG do these toolholders but supply seems intermittant.
Paul