Thank you for that, Jazz. Yes, indeed, the wiring is that easy, and essentially that's exactly what I was going to do. The difference was that I was going to wire in the REV connection as well, hence the need for four cores. But thinking through what you wrote, I realise that in the four years I've been using it, I have never ever used "reverse" on the spindle, and I can't imagine why I ever would. Drop that, and I can happily use one piece of CY for the lot. Sometimes you can be too close to a problem!

Thanks again - I'll get that wired and tested later.