Posted by Phillip Bradshaw on 04/03/2019 12:22:04:
… I believe a (major?) obstacle is the protrusion into which the post itself threads requiring that the base be drilled out further…
Could you turn down and thread the post that comes with the toolpost to fit your lathe (or even make a new one), leaving the lathe unaltered?
I'm afraid I cannot recommend any particular toolposts (other than avoid the very cheap aluminium ones – I wish I had avoided them), but if you look on Arc Euro Trade's website the specifications of each of the ones they sell are shown in full, so you could work out the size you want from there.
Brian