Thanks for that, Gerry. Had a bit of a look around, and I find no bargains to be had. So in that case, Huanyang wins big time on price!

Taking the question a little further - is there anything special or specific about the Huanyang VFD that makes it a particularly good choice for use with the Chinese spindles? Or in reality can any decent VFD be used? Certainly when I converted my manual machines to variable speed drives, I just chose respectable makes with a good enough spec, when they came up on eBay. It worked well. I kind of see the spindle as a different beast - but maybe it isn't? It obviously runs at much higher frequencies than a regular 50Hz type induction motor, but otherwise? Or am I missing some subtleties here?