Schaublin 102-80 screw cutting attachment and VFD for existing 2 speed 3ph motor?

I bought a 102-80 last year and it's in pretty good order, it included the rear mounted screw cutting attachment in pieces which I've almost figured out although it only came with one "Star shaped chaser" It seems I'll need different sizes if I'm to cut finer threads?
Also need to do a 2phase input VFD to drive the 3phase 2 speed motor?
Thanks from Australia

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